The detention room became the quietest place in Hogwarts.
That was not natural.
Hogwarts did not do quiet well. Pipes knocked. Portraits muttered. Armor shifted when no one watched. Peeves existed as a personal insult to silence.
But outside the lower west corridor, even Peeves refused to drift too close.
The sign on the door read:
DETENTION IN PROGRESS. DO NOT DISTURB.
For most students, that was enough.
For Peeves, the yellow talismans around the frame were enough.
For the thing below the lock, the room was a listening hole.
For Voldemort, it was an insult.
He had hidden in forbidden forests, survived as less than a ghost, crossed seas, possessed a professor, prepared a formation, touched a dream under Hogwarts, and now found himself sitting in a detention room under a sign written by Argus Filch.
Humiliation had become too small a word.
Quirrell sat bound to the chair, head lowered.
The thorn on his forehead glowed faintly.
The mark beneath the chair pulsed once every few minutes, sending a thin signal into the decoy path Theodore had prepared. Each pulse carried a carefully shaped echo.
Fear of the door.
Concern about Dumbledore's blood.
Urgency.
Resistance.
Just enough truth to taste real.
Not enough truth to help.
Voldemort knew he was not receiving everything.
That angered him.
But he also knew the thing below had answered.
That tempted him.
Anger and temptation pulled in opposite directions.
Quirrell suffered between them.
The door opened.
Snape stepped inside.
Quirrell's body stiffened.
Voldemort became still.
Snape looked around the detention room with distaste.
"I see your accommodations have improved."
Quirrell let out a weak breath.
"Professor…"
"Do not sound grateful. It is unpleasant."
The thorn warmed.
Voldemort's voice slid through Quirrell's mouth.
"Severus."
Snape's expression did not change.
"Still borrowing other people's mouths, I see."
The mark beneath the chair pulsed sharply.
Voldemort's anger fed it.
The room darkened for a second.
Snape noticed.
So did Theodore, who was watching from the Room of Requirement through the Wuzhuang foundation.
Snape did not need instructions.
He understood the principle now.
Do not let Voldemort become the center.
Drag Quirrell back.
Snape looked down at Quirrell's hands.
They were trembling.
"Your fingers shake before he speaks," Snape said. "You always were easy to read."
Quirrell's eyes flickered.
His own embarrassment surfaced.
Small.
Useful.
Snape continued coldly, "In staff meetings, you tapped your left thumb against your teacup whenever Minerva asked you a question."
Quirrell blinked.
The thorn brightened.
A memory answered.
The staff room.
Tea.
McGonagall's stern look.
A stack of books nearly falling from his hands.
His own nervous laugh.
Voldemort hissed inside him.
"Meaningless."
Snape's lip curled.
"Yes. That is the point. It is his meaninglessness, not yours."
Quirrell gave a broken sound that might have been a laugh.
The mark dimmed.
Voldemort hated that laugh more each time it appeared.
Outside the room, Filch stood guard with Mrs. Norris.
He heard nothing clearly through the door, but the talisman above the frame changed color from blackish-red back to yellow.
Good.
Filch nodded to himself.
"Detention works."
Mrs. Norris meowed.
"I have said so for years."
By lunchtime, the detention room had become part of a schedule.
Dumbledore visited in the morning.
Snape visited after classes.
Filch guarded the corridor and refreshed talismans.
Theodore monitored the mark.
Fawkes came and went as needed, though every time the phoenix appeared, Voldemort retreated deeper and Quirrell looked as if he might cry from relief.
It was strange.
It was ugly.
It worked.
In the Great Hall, Hermione noticed Theodore writing something on a small piece of parchment.
Not homework.
Not notes for class.
A formation draft.
She leaned closer.
"What is that?"
"A lesson plan."
Ron, who was drinking pumpkin juice, coughed.
"For whom?"
"The thing in detention."
Harry looked up.
"The thing below the lock?"
"The part of its dream we trapped."
Ron wiped his mouth.
"You're teaching the nightmare?"
"Yes."
Ron stared at him.
Then slowly said, "I know I ask this a lot, but are we the good side?"
Hermione elbowed him.
Theodore replied calmly, "We are the side with classrooms."
Ron considered that.
"That does sound like Hogwarts."
Hermione looked at the parchment again.
"What are you teaching it?"
"What happens when it reaches too far."
Harry frowned. "Can it learn?"
"It already is."
"That is bad."
"Only if we learn slower."
Ron leaned back.
"I miss normal subjects. Like Potions. Actually no, I don't. Forget I said that."
After lunch, Theodore entered the unused Defence classroom on the third floor.
The dream mist remained trapped inside.
It had shrunk since the previous night, no longer filling the whole room. It hovered near the teacher's desk, gathered into a dark, restless cloud. The desks had been repaired by Hogwarts magic, but one still had a bite mark from Willow Immortal's root.
The blackboard was clean.
Theodore closed the door behind him.
The talismans outside burned softly.
The dream mist turned toward him.
The room chilled.
Theodore walked to the teacher's desk and placed the parchment down.
"Today, we continue."
The mist did not respond.
Theodore picked up a piece of chalk.
On the board, he wrote:
Rule One: If you touch students, you lose something.
The mist twisted.
The air whispered.
Children are openings.
Theodore nodded.
"Yes."
He wrote another line.
Openings can be trapped.
The floor lit green-gold.
The mist rushed toward the ceiling, then stopped before touching the Wutu seal above. It had already learned that route was closed.
Good.
Theodore raised one finger.
A tiny strand of dream residue floated from the mist and was pulled into a small leaf seal.
The mist shrank.
Not much.
Enough.
Theodore wrote:
Example.
The mist trembled.
Behind the black door far below Hogwarts, the hunger felt the loss.
Small.
Annoying.
Not painful.
Yet.
Theodore continued.
"You searched the common rooms. We built barriers."
A faint image appeared on the board: four common room regions wrapped in green-gold lines.
"You searched classrooms. You entered this one."
The image changed to the Defence classroom.
"You reached Quirrell. We gave him a thorn."
The image changed again.
A chair.
A bound man.
A mark beneath him.
The dream mist stirred more sharply at that.
It recognized the connection.
Theodore wrote:
Every path teaches both sides.
The mist slowly formed a question.
Not with words.
With pressure.
Why teach the enemy?
Theodore smiled.
"Because students learn faster when the lesson bites back."
The room went silent.
The blackboard cracked down the middle.
The dream did not like the answer.
Theodore raised his hand.
Fuxi Divine Heaven Resonance brushed the room.
The crack sealed itself.
The mist compressed again.
Another tiny strand was taken.
Far below, behind the lock, the black door's mark flickered.
The thing behind it was listening.
Good.
Let it listen.
Let it think Theodore was arrogant enough to teach it.
Arrogance was believable.
Especially because it was partly true.
That evening, Dumbledore visited the detention room.
Quirrell looked worse but more present.
That was the strange part.
His body was weak. His skin was pale. His eyes were sunken. Yet when Dumbledore spoke to him, Quirrell answered half a second sooner than before.
That half second mattered.
"Do you remember your first class?" Dumbledore asked.
Quirrell stared at the floor.
"Yes."
"What did you teach?"
"Vampires."
Dumbledore smiled faintly. "You brought too much garlic."
Quirrell's lips twitched.
"Students laughed."
"They did."
"I thought I would resign that night."
"But you did not."
Quirrell swallowed.
"No."
The thorn glowed.
Voldemort stirred.
Weakness, he whispered.
Quirrell closed his eyes.
Then, quietly, he said, "Mine."
Dumbledore's expression changed.
The word had not been brave.
It had barely been audible.
But it was Quirrell claiming something shameful as his own.
That made it strong.
The black mark beneath the chair pulsed angrily.
The decoy path fed that pulse downward, carrying exactly what Theodore wanted the thing below to hear.
A soul resisting possession.
A hungry remnant struggling.
A lock surrounded by fear and stubborn identity.
The thing below listened closer.
Too close.
In the Room of Requirement, Willow Immortal's leaves rustled.
Theodore looked at the model.
The black door under the lake had not opened.
But the mark on it had brightened.
The bait was working.
Perhaps too well.
Theodore raised his hand and steadied the lake layer.
"Not yet."
Willow Immortal sent an image through the roots.
A question.
If not yet, then when?
Theodore looked toward the miniature detention room, then the trapped classroom mist, then the lake seal.
"When it reaches with more than a whisper."
At midnight, the thing below did exactly that.
The detention room went dark.
The talismans on the door burned blue.
Filch, who had been half-dozing on a stool outside, shot upright.
Mrs. Norris hissed so sharply that the sound echoed down the corridor.
Inside, Quirrell's shadow stretched toward the floor mark.
Voldemort laughed.
Not loudly.
Triumphantly.
The mark beneath the chair opened like a black flower.
But instead of reaching the real door below the lake, it reached Theodore's decoy.
The dream below pushed through.
A thin black finger formed from mist and hunger emerged from the mark.
It touched the floor.
The detention room answered.
Stay.
The finger paused.
Theodore appeared in the doorway.
He had not walked there.
Space had folded.
Filch jumped.
"Warn a man!"
Theodore looked at the black finger.
"So you came."
The finger slowly turned toward him.
Behind it, through the mark, something vast tried to see.
Voldemort's smile froze.
He realized too late that he was not the one pulling anymore.
He was the hook.
Theodore lifted two fingers.
The trapped dream mist in the third-floor classroom stirred.
The lake layer brightened.
The nine nails under the pitch lit up.
Willow Immortal's roots tightened around the detention room.
Theodore spoke calmly.
"Lesson Three."
The black finger twitched.
The floor sealed around it.
"Do not put your hand into someone else's cage."
The green-gold roots snapped shut.
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