"Absolute motion does not exist, and absolute stillness does not exist either."

"From an objective point of view, the motion and stillness of an object are relative, relative to the chosen frame of reference."

Filius Flitwick stood on a high pile of books, surveying the curious young witches and wizards around him.

"Now, students, before we learn the Freezing Charm, I have a small question: Compared to the spells we've learned before, what essential commonalities do they have? And what are the differences? I mean, compared to the Fire-Making Charm, the Levitation Charm—ah, Miss Granger?"

"The commonality is that we are all using magic to change the properties of objects. As for the differences..."

Hermione hesitated for a few seconds, and said softly with some uncertainty, "Is the frame of reference for the Freezing Charm subjective perception, rather than objective existence?"

With the Hogwarts New Curriculum Reform, the knowledge in the textbooks was no longer sufficient to answer all questions.

Many classes began to become flexible and varied. Even outstanding students like Luna and Hermione often couldn't fully grasp the professors' questions, piecing together the correct answer that conformed to the professors' latest theories from various pieces of information.

Except for Aileen, the undefeated record of all students was broken this semester.

"Absolutely correct! Five points to Gryffindor!"

Flitwick said happily, waving his wand gently in the air.

"The Freezing Charm, the incantation is 【immobulus】, and the casting action is also quite simple, just point the wand and recite the spell—the biggest difficulty with this spell is that your mind must be very clear, and the magic release must be focused. In the past textbooks, we would have focused more on your casting target, but according to my latest research results, observing yourself appropriately will improve the success rate of the spell release."

"Perhaps it's not very intuitive to say it that way, so let me think... Miss Kaslana."

Flitwick pondered for a moment, then looked down at Aileen, who was sitting in the first row of the classroom.

"Now, please pick up your textbook and throw it at me—you can use your special skills from the Quidditch pitch, I mean that terrifying high-speed throw, and then let's see how the Freezing Charm works correctly in this situation."

"Eh? Are you sure you want to take a direct hit, a power throw?"

Aileen was stunned, looking at Professor Flitwick with a strange expression.

That was a forbidden skill that almost ended the first Dark Lord directly.

Even if the weapon wasn't a fist, a Quaffle, or other sharp or fluid-state objects, being hit by a copy of *Basic Charms, Level 2* at such a close distance would probably send Professor Flitwick straight from the Charms classroom to St. Mungo's Hospital for Magical Maladies and Injuries.

"Don't worry, I was a dueling champion when I was young."

Professor Flitwick smiled gently, raising his wand leisurely.

Since Hogwarts re-sorted the first and second year classes, each class was no longer a combination of two Houses, but formed by students from all four Houses. He was taking this opportunity to teach students how to use magic to deal with brute force.

In fact, in tomorrow's second year Class B, Flitwick would also invite Hannah to cooperate.

After all, Aileen and Hannah's strength had begun to shake many students' confidence in magic without them even realizing it.

"Well, okay, if you insist..."

Aileen pouted, glanced at Professor Flitwick's determined expression.

This wasn't a life-or-death struggle, and given Umbridge's presence as an observer, she didn't plan to be too outrageous. After thinking for half a second, she silently and quietly "rua-ed" three standard doses, casually grabbing the *Basic Charms, Level 2* from the desk.

"Careful, I'm throwing now—"

*Boom!*

Before anyone could react, a black blur crossed space, heading towards the top of Professor Flitwick's head.

And along with the *Basic Charms, Level 2* that shot out like a cannonball, Professor Flitwick's calm and clear incantation sounded in the classroom.

"immobulus!"

In the next moment, a powerful magic burst out from the tip of Professor Flitwick's wand.

The unstoppable *Basic Charms, Level 2* seemed to have been paused, hovering in mid-air.

And only then did Hermione's annoyed voice emerge.

"Hey! That's my book! Aileen!"

"Sorry, didn't notice the name, I'll give you this one for now—"

Aileen replied to Hermione casually, without any sincerity, looking at the textbook floating quietly in mid-air with great surprise.

Strictly speaking, this wasn't the first time she had seen the "Freezing Charm."

A few months ago, Dumbledore had used a similar method to stop her Quaffle, but compared to Professor Flitwick, the Spicy Radish directly omitted the wand movement and basic spells, completing the spell simply by using the simple everyday word "stop."

And even earlier, before Aileen arrived in this world, she had briefly learned about this magic in movies and books.

If the timeline hadn't changed, then when Hermione and her "useless classmates" faced the Cornish Pixies, Hermione would use this spell to unleash a "theworld"-like time-stopping ability, successfully completing Lockhart's "pop quiz."

"So, Professor, the actual effect of this spell is—to use magic to keep an object within a certain area relatively still to the caster?"

Aileen recalled Professor Flitwick's introduction just now, and asked softly thoughtfully.

A spell is a controllable application of magic presented in a supernatural way with the aim of influencing all things in the world, generally used by wizards or witches, and sometimes by other magical creatures—this is the standard definition written in *Basic Charms*.

Generally speaking, the successful use of a spell requires satisfying four basic conditions:

Specific wand movements, correct incantation, caster's subjective awareness of the spell's effect, and a certain degree of focus by the caster.

Compared to the latter two factors, the former two are more like encoded "magic casting instructions," which can help young witches and wizards better sort out their magic, just like molten iron poured into molds in a steel mill, forming some specified magical effects.

*Basic Charms, Level 2* does not explain the core of spells in detail, it is more like a manual than a popular science textbook.

Even if students don't really understand the meaning behind those spells, they can cast them smoothly.

"That's about right, but not entirely accurate."

Professor Flitwick smiled and nodded, gently waving the wand in his hand.

The *Basic Charms, Level 2* floating in mid-air floated back to Aileen and Hermione's desks.

"Establishing a stationary frame of reference is especially important. In real life, we are not always in a 'completely still' state—we may be on a flying broom, on the Hogwarts Express, on the back of a Pegasus, or running, or falling..."

Professor Flitwick continued, looking around at the students in the classroom who seemed to understand, and tapped the blackboard behind him gently with his wand.

"On the other hand, when you cast a spell, the meaning you think about in your mind is best to be stopping, rather than freezing."

"Ahem, ahem."

Professor Umbridge coughed.

This was the first time she had actively interrupted Professor Flitwick's speech since class began today.

Professor Flitwick frowned, turning his head to look at her in confusion.

"What's wrong, Professor Umbridge?"

"Oh, Professor, I just want to roughly confirm that the theories you just mentioned don't seem to be in line with the o.w.L.s content—"

"The update of textbooks and test papers is often delayed, but in the field of spells, more accurate and safer spellcasting is obviously the most important. Our core is to teach students how to cast spells and understand how to choose the most appropriate spell to solve the problems they may encounter."

Professor Flitwick bowed politely, turned his head to look at the students again, and continued.

"Just as I said earlier, the core of the Freezing Charm is 'freezing motion' rather than lowering the temperature—"

"Ahem, ahem."

"Hmm? Are you...not feeling well?"

"In the n.e.w.ts exam, one of the items is a practical assessment for the 'Freezing Charm'. Candidates should accurately freeze the paper bird manipulated by the examiner using the spell within ten seconds. If I remember correctly, that is a rather cold examination item. Of course, I am not questioning your expertise in Charms, but from the current situation, your teaching content and methods seem to be quite different from before..."

Professor Umbridge said with a smile. As Senior Undersecretary to the Minister for Magic, she had also achieved good grades at Hogwarts.

And Charms happened to be her strong subject.

Although she was slightly weaker in terms of counter-curses, she had always been quite outstanding in terms of spell completion and success rate.

"Oh, you're talking about this, this is a higher grade course. In the micro field, some wonderful changes—temperature changes are just phenomena."

Filius Flitwick said with an unchanged smile, "Of course, in lower grades, I think it is better to first understand from a macroscopic perspective, so that students can first build a correct and solid foundation, which will be more conducive to them mastering those high-level spellcasting skills."

"Phenomena? Microscopic, macroscopic? Professor Flitwick, you wouldn't be..."

Umbridge raised an eyebrow, tapped the writing board twice lightly with her quill, and said sweetly.

"These sound like things that Muggles study. Do you think it is necessary for wizards to learn Muggle knowledge before learning how to release spells? For example..." She raised her toad-like swollen eyes and looked at the blackboard, "Those naive, superficial, and time-wasting formulas and theorems you wrote on the blackboard, this should be Hogwarts, not a Muggle school, right?"

"Superficial? Naive? You know, I studied for more than a week before I just figured out a little knowledge."

Flitwick was stunned for two or three seconds, scratching his left forehead helplessly, and spread his hands.

"And just this little change, fed back into the spell release, whether it is casting stability, casting speed, spell strength... the improvement it brings can be said to be a qualitative change. This is new knowledge, Professor Umbridge, when you were taking classes at Hogwarts, I should have said—in the process of learning spells, impetuousness and complacency are big taboos. If you can't understand it, just learn with the children, it's not shameful..."

Professor Umbridge looked like she had been hit with a silencing spell, opening and closing her mouth several times.

Unlike the other professors, Filius Flitwick can be said to be the third oldest wizard in this school in terms of qualifications.

Not to mention Umbridge, 99% of the officials in the Ministry of Magic today were once his students.

Therefore, when Professor Flitwick announced that she would rejoin the class, she had almost no room to refute.

However, compared to emotional embarrassment, what Umbridge found most unacceptable was that the accident in Charms completely disrupted her plan—if she spent too much energy reviewing this course, not only would she be unable to continue her subsequent work, she might not even have a basic foundation.

But if she pretended that she hadn't noticed anything and directly approved it according to the original plan...

Umbridge straightened the parchment on the writing board, looked at the writing on the blackboard with a solemn expression, and scribbled a few words.

According to the news from the Ministry of Magic, Filius Flitwick does not belong to Dumbledore's camp, which means that if they don't want to eventually face a complete Hogwarts, they have to make some compromises—after all, she still has to free up her hands to review that Deputy Headmistress.

It's just, this is Charms... If something really goes wrong...

Professor Flitwick looked indifferent, ignoring the silent Umbridge, and said to the whole class again.

"I said just now: the Freezing Charm, depending on the frame of reference and the range and precision of the object we are targeting, the performance it presents in the fields of vision and touch will also be different. But I hope you always remember one thing, its core effectiveness. In the early stages, I want you to do your best not to affect the surrounding temperature—low temperature means that there are distractions in your mind, or that your magic has overflowed..."

"Okay, now I will explain in detail how to build and maintain a stationary frame of reference based on each of you—"

"Aileen, do you know what the high-level casting technique that Professor Flitwick was talking about is?"

Hermione asked in a low voice, as usual, she and Aileen perfectly completed the spell casting almost at the same time after Professor Flitwick's explanation—there was no temperature drop, and the thrown paper ball was silently frozen in the air.

This obviously met Professor Flitwick's requirements, but it did not match the descriptions Hermione had seen in other spell reference books.

"It's very simple, just change the angle to observe the world."

"Change the angle...observe the world?" Hermione blinked in confusion.

"Well, it's like this—"

Aileen smiled slightly, secretly glanced at Flitwick who was still busy at the back of the classroom, and gently pointed her finger at Hermione.

"ZA WARUDO!"

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Yay!