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Mind the fine print.
The castle is listening.
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Snape began class by writing Harry’s mistake on the board.
He did not use Harry’s name.
He did not need to.
The sentence appeared in hard white chalk before the first cauldron had warmed.
An incomplete answer is often more revealing than an incorrect one.
No one spoke.
The dungeon seemed to enjoy that.
At his station, Harry stood with a mortar, a chipped silver knife, and the uncomfortable sense that the room had been arranged around his pulse.
The book from the library, the gray one with the faded words, had followed him into breakfast, into the corridor, and now into Potions without ever leaving his bag.
Draco worked two benches over, too quiet.
Hermione sat with the Gryffindors, spine straight, quill ready, eyes moving between Snape and the board.
Ron pretended to read the ingredient list with the grim attention of a man hoping nettle might become a door.
Snape swept past the front bench.
“Today, we will discuss stabilizing agents.”
His voice made stabilizing sound like an accusation.
“Many of you will fail to understand the difference between a stabilizer and a suppressant.
That failure may cost eyebrows, dignity, or skin, depending on the stubbornness of the brewer.”
Neville swallowed.
Snape smiled without warmth.
“Some of you may also believe that withholding part of an answer makes you clever.”
Harry kept his face still.
It was easier than looking innocent.
There were classrooms where stillness could pass for innocence.
This was not one.
“Mr.
Potter.”
He looked up.
“Professor.”
“Explain the function of powdered moonstone when added to a draft meant to calm reactive enchantments.”
Hermione’s quill froze.
Not a first-year question.
Not even close.
The sensible answer was ignorance, plain and clean.
Harry found the answer anyway, not as one whole thing but as pieces: old reading, old memory, the gray book, the word Stone, the question Hermione had not finished asking, and Snape choosing a category that brushed against wards without saying the word.
Powdered moonstone could smooth volatility in some charm structures.
Too much made a ward slow to answer.
Wrong heat made it bind to the carrier instead of the enchantment.
Added after serpent bile, it could smother threshold recognition.
That last part mattered.
Too much.
“It can reduce overreaction in unstable magical structures,” Harry said.
Snape’s eyes sharpened.
“Can?”
“If the base is prepared correctly.”
“And if it is not?”
Harry heard the gap open.
He stepped toward it anyway.
“Then it dulls the structure.”
“Dulls.”
The word hung there, ugly because it was almost right.
“Suppresses,” Harry said, and hated how Hermione’s quill moved at once.
Snape came closer.
The dungeon seemed to grow smaller around his robes.
“What does suppression do, Mr.
Potter?”
Harry could answer more.
He could mention thresholds.
He could say too much and make Snape’s attention worse.
He could lie and be caught by a man who seemed to dislike him best when he was correct.
He chose badly.
“I don’t know.”
For a moment, nothing moved except steam.
Then Snape turned away.
“Ten points from Slytherin.”
The room inhaled.
Draco’s knife stopped against his cutting board.
Even the Gryffindors looked startled.
Snape taking points from Slytherin in public had the social weight of a wall deciding to bleed.
At Harry’s own table, the damage spread faster than sound.
Pansy looked offended on behalf of a House she had not been awake enough to defend five minutes earlier.
Zabini’s brows rose with genuine interest.
Nott wrote one word in the margin of his notes and covered it with his hand.
Draco did not smirk.
Somehow that was worse.
He looked as if someone had confirmed Harry could be separated from the House whenever the cut served someone.
Across the room, Ron’s face twisted with sympathy he clearly wished he had not felt.
Hermione looked furious enough for both of them.
Harry stayed still.
Snape looked back.
“For lying badly.”
The words landed harder than the point loss.
Not because of the punishment.
Because everyone had heard the answer inside the lie.
Snape tapped the chalk sentence once.
“An incomplete answer tells me what you know.
A bad lie tells me what you hoped I would not ask next.”
Hermione’s quill began moving again, furious little scratches.
Ron whispered something that sounded like, “Bloody hell,” and for once nobody corrected him.
“Since Mr.
Potter has volunteered the limits of Slytherin honesty,” Snape continued, “we will brew the stabilizing base without moonstone.
Perhaps absence will teach where pride has failed.”
Instructions appeared on the board.
The potion was simple in outline and vicious in timing: lacewing, nettle, shaved bezoar rind, three turns counterclockwise, heat lowered before the mixture turned blue instead of after.
A beginner could follow the list.
A beginner could also lose the potion in the space between almost right and ruined.
Harry was, annoyingly, a beginner.
His other life had not come with muscle memory for cauldrons.
He chopped nettle too slowly, corrected, then corrected too hard.
He lowered heat late.
The surface went cloudy at the edges.
Across the aisle, Draco’s potion stayed a clean green-gold.
Malfoy adjusted the flame with practiced fingers and looked away, not generous enough to help and not crude enough to laugh.
Pureblood heirs had learned small magics before Hogwarts.
Harry had learned to cook eggs while trying not to be blamed for the pan.
Different education.
Not lesser.
Not enough.
“Problem, Potter?” Snape asked from behind him.
“Several, Professor.”
“At least one of them has been identified.”
Harry pressed his mouth shut.
The kettle nearest Neville gave a sad little spit, as if disappointed by everyone involved.
Snape leaned closer, voice low enough that only Harry and the next bench could hear.
“Sarcasm does not compensate for skill.”
“No, Professor.”
“Nor does memory.”
The knife slipped.
Barely.
Enough to nick the side of his thumb.
Pain stung bright.
A single bead of blood formed and held there, red against potion-stained skin.
Snape saw.
He said nothing.
The silence did more work than a lecture.
Harry wrapped the cut in the edge of a cloth and dropped the shaved rind into the cauldron one piece at a time.
The brew shivered, steadied, then clouded again.
Behind him, Hermione raised her hand.
Snape ignored it for several breaths.
She kept it raised, elbow rigid, face going pink with the effort of not exploding.
“Miss Granger.”
“The instructions on the board omit the resting interval after nettle.”
“Do they?”
“Yes, Professor.”
“And what conclusion do you draw from this outrage?”
Her chin lifted.
She was still embarrassed from the library.
Harry could see it in the exactness of her posture.
“That the omission is intentional, or the exercise expects us to notice the older method before we ruin the base.”
The dungeon went quiet again.
Ron looked as though he wanted to vanish under the bench and applaud from there.
Snape’s eyes flicked to Harry.
“And which do you believe?”
Hermione swallowed.
The answer she wanted was sharp.
The answer she chose was smaller.
“I believe I should wait before adding the rind.”
Snape smiled very slightly.
“Five points from Gryffindor for assuming a question is an invitation to instruct the class.”
Hermione went red.
“Five points to Gryffindor for noticing the interval before your cauldron noticed it for you.”
No one seemed to know whether to breathe.
Snape turned back to the room.
“Those who did not notice the interval may now decide whether pride or correction matters more to them.”
Cauldrons resumed.
Harry lowered the flame, counted twelve breaths, and watched the cloudiness thin by degrees.
The potion would not earn praise.
At the end of class, Snape inspected each vial with surgical disappointment.
Draco received a clipped “acceptable.” Hermione received a pause, then “technically adequate.” Neville received silence, which was almost mercy.
Harry’s vial sat between Snape’s fingers, cloudy but stable.
“Mediocre,” Snape said.
“Yes, Professor.”
“Not disastrous.”
Harry let the first answer die behind his teeth.
“No, Professor.”
Snape placed the vial on the tray.
“Stay.”
Every Slytherin heard it.
Every Gryffindor too.
Hermione gathered her books slowly.
Ron lingered by the door until Snape’s stare moved him into the corridor.
Harry stayed beside the bench, hands visible, wand untouched, thumb beginning to ache.
Only when the last student left did Snape speak.
“You knew more than you said.”
“Yes.”
“And less than you implied.”
The quieter answer took longer.
“Yes.”
Snape’s gaze dropped to the cloth around his thumb, then to the cooling cauldrons.
“Moonstone suppression is used in crude attempts to quiet wards without breaking them.
It leaves residue.
It leaves arrogant fools certain they have been subtle.”
Harry kept breathing.
“Is that what someone is doing?”
“That is what a student who values his skin would report to an adult before investigating.”
The word adult did not sound kind in Snape’s mouth.
It sounded like an accusation aimed at both of them.
Harry looked at the workbench.
A sliver of glass near the rack caught the torchlight.
Clear.
Sharp.
Easy to miss until it opened skin.
“Would you have listened if I had said I only had a corner of it?”
“No.”
It should have been satisfying to be proved right.
It was not.
Snape stepped closer.
“The next time you lie to me in class, Mr.
Potter, I will assume the subject is dangerous.”
Harry nodded once.
“The next time you answer too neatly, I will assume the same.”
It was not help, exactly.
It was a boundary made of threat because Snape did not seem to own another material.
Harry’s scar gave one cold pulse.
No pain.
Warning, maybe.
Memory, maybe.
He could not tell.
Snape saw the eyelid twitch and said nothing.
Silence filled the room until the cauldrons sounded loud.
“Professor,” Harry said, then stopped.
Snape waited with visible dislike for waiting.
“When you say residue,” Harry tried again, “would glass hold it?”
Snape’s face changed by less than a breath.
Not surprise.
Recognition quickly murdered.
“Glass holds what careless hands leave on it.”
Not an answer.
Also not nothing.
Harry tucked the clue away and hated how small it was.
Snape turned toward the door.
“Get out.”
He did.
In the corridor, Hermione stood beside a suit of armor with her arms crossed.
Ron was there too, badly pretending he had not stayed.
“Well?” Hermione asked.
Harry looked back at the classroom door.
He had lost points, cut his thumb, worsened his standing in Slytherin, and learned that someone might be trying to quiet a ward instead of break it.
He had not won anything.
“Moonstone matters,” he said.
Hermione’s anger faltered into interest.
Ron groaned.
“I hate it when that counts as an answer.”
Behind the closed classroom door, glass broke.
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