The first time Harry had a real chance to stop one of Tom's smaller manipulations, he chose the wrong target.
It happened in the library, which was fitting in ways Harry only understood later. The library was a place of quiet organization, of seemingly neutral structures—catalogues, shelves, sections, systems of access and denial. It looked fair. Everything had a place. Everything could be found if one searched properly. That was precisely the sort of environment in which Tom's method became hardest to see. Not because he hid there, but because the room itself encouraged everyone to believe that what happened within it was governed by reason.
Harry entered midway through an argument.
A Ravenclaw and a Gryffindor had both been working from the same reference text over the last few days. That alone was unremarkable; first-years drifted toward the same books constantly, especially once exams and written assignments began accumulating enough weight to produce shared urgency. What Harry did not know on entering—and what Tom, somewhere at the far end of the aisle, had already accounted for—was that each of them had been adjusted separately in the days before.
The Ravenclaw had grown firmer, more dismissive when contradicted in areas she felt secure in. The Gryffindor had grown less willing to defer when challenged and more invested in defending his own half-formed certainty. Neither of these changes was large enough to invite notice alone. Together, in the right moment, they created friction.
The argument itself, at first glance, seemed trivial. Who had properly reserved the book. Whose notes were more accurate. Whether interpretation or direct citation mattered more in a passage dense enough that both students were likely only half-certain of their own readings anyway. Voices remained low by ordinary standards, but the tension around them had already begun pulling attention from nearby tables. A few students were pretending not to watch. Others had stopped pretending.
And Harry saw Tom.
Not speaking. Not intervening. Merely present at the far end of the aisle, replacing a book on the shelf.
That was all it took.
By now Harry had accumulated too much pattern-recognition around Tom to interpret coincidence cleanly. He saw him and the argument in the same frame, and instinct leapt ahead of structure before thought could catch up.
He crossed the room.
"What did you do?" he snapped.
The question landed too loudly.
Too publicly.
And immediately Harry knew, in the awful half-second after speaking, that something had gone wrong.
The argument stopped—not because it had been resolved, but because he had shifted the room's attention. The Ravenclaw looked up first, annoyed. The Gryffindor flushed with the kind of embarrassment that comes when private humiliation is suddenly made communal. Several students nearby straightened slightly in their seats. Even Madam Pince, at a distance, seemed to sharpen without yet intervening.
Tom turned with measured surprise.
"At the moment?" he said. "Shelved a book."
A few students laughed under their breath.
Harry flushed but pressed on, because retreat in public would have been worse. "You were here."
"Yes."
"You always are when things go strange."
That was the wrong sentence.
Not because it was false. Harry still believed it wasn't. But because spoken aloud, in that room, it sounded childish. Superstitious, almost. Like accusing someone of haunting bad weather because they happened to be present whenever rain fell.
The Ravenclaw, already irritated and primed by her own pride, cut in sharply. "This has nothing to do with him."
The Gryffindor, mortified now that the argument had been reframed around him rather than around the actual dispute, muttered, "Leave it, Potter."
And just like that, Harry had done Tom's work for him.
By misplacing the accusation, he made Tom appear reasonable by contrast and made himself look obsessive. Worse, he gave the original participants an immediate common target around which their separate embarrassments could briefly align. For one moment, Harry had relieved the very tension he had meant to expose.
Tom did not exploit the opening crudely. That would have been a mistake, and Harry, even in humiliation, would have recognized it. Instead he chose the gentlest available correction.
"If you wish to stop arguments, Harry," he said evenly, "it helps to know what they are about before selecting a villain."
The room accepted the sentence at once.
Because it sounded fair.
That was the unbearable part. It was fair, at least on the visible surface. Harry had no evidence he could point to in that moment. Only pattern. Only instinct sharpened by weeks of watching the same kind of thing accumulate around the same boy. But instinct, publicly detached from sequence, rarely looked like intelligence. It looked like obsession.
Harry wanted to argue anyway. He wanted to say that the argument itself wasn't the point, that Tom never needed to cause things directly, that being present was not innocent in the way others assumed. But every version of that explanation sounded thinner when spoken into the silence of the library, under the eyes of students already predisposed to prefer the cleaner story.
So he failed twice in rapid succession: first by accusing without structure, then by recognizing too late that structure had already been taken from him.
He left.
Not dramatically. Not with some final line that might have recovered ground. He left the aisle in stony silence, every step carrying the heat of humiliation further inward rather than outward. The room resumed behind him in the strange subdued way places do after a public misstep—conversation restarting, chairs shifting, no one openly discussing what had just happened and everyone storing it anyway.
Tom watched him go without visible satisfaction.
That mattered too.
If Tom had smirked, or pressed harder, or looked pleased, Harry could have held onto anger cleanly. But Tom merely turned back to the shelf and completed the ordinary action he had been performing when Harry interrupted him. The gesture was so controlled, so mundane, that it turned Harry's mistake from moral urgency into social clumsiness.
That evening, Hermione told him exactly what he had already begun telling himself, though more gently than he deserved.
"You can't challenge him unless you know precisely what you're saying," she said.
They were in the common room, somewhat apart from the others. Harry had delayed telling her because saying it aloud meant submitting the scene to reconstruction, and reconstruction would make every wrong step sharper. Hermione, however, had reached the point where she could read certain failures on his face before he spoke them. She listened without interruption, only once asking him to repeat the exact wording Tom had used in reply.
When he finished, she was quiet for a moment.
Then: "You chose the wrong frame."
Harry looked up, irritated enough with himself that he did not bother hiding it. "Brilliant. Thank you."
Hermione ignored the tone. "No, listen. You accused him of causing the argument in the immediate sense. That isn't how he works. So the people actually involved could reject you honestly."
Harry stared into the fire. "I know."
"He didn't even have to defend himself properly," Hermione continued. "You handed him the reasonable position."
That hurt because it was true.
Ron, who had been lingering nearby in the posture of someone waiting to be drawn into the conversation against his better judgment, finally muttered, "I still don't know why you lot keep talking like he's behind every little thing."
Hermione's head turned sharply enough that Ron sat back a fraction.
"Because little things are the point," she said.
Ron opened his mouth, then closed it again. Even he had begun to understand, dimly, that what disturbed Harry and Hermione was not the size of the incidents but their repetition and distribution. He still did not feel the pattern the way they did. But he had stopped being reassured by its smallness.
Harry said nothing for a while.
He already knew Hermione was right. That was the worst part. The humiliation in the library had not taught him something new so much as it had confirmed a flaw he had been circling for weeks. His instincts remained morally strong and structurally weak. He still lunged toward the visible shape of wrongness instead of mapping its mechanics first. He acted where pressure was showing rather than where it had been arranged.
Tom knew this now too.
Across the castle, Tom recorded the incident as useful proof.
Harry's instincts remained exactly what Tom had increasingly suspected them to be: morally sincere, emotionally fast, and structurally imprecise under pressure. That combination made him dangerous in certain ways—especially where direct harm or obvious injustice was concerned. Harry would always move toward visible wrongness. He would take risks other students avoided. He would absorb cost more readily than most.
But in a system built on subtle preparation rather than obvious provocation, that same quality could be made to misfire.
He could still be made to miss.
Tom did not overvalue the lesson. Overconfidence built from one successful humiliation would have been childish. Harry was capable of learning, and he had already improved more than Tom initially expected. But the library incident confirmed a stable tendency: if forced to choose quickly between atmosphere and event, Harry still privileged the visible event. He needed something to oppose. Tom's method, most of the time, remained one step removed from opposition.
That was enough.
Later that night, in the dormitory, Nott asked from the darkness, "Potter did something stupid."
Tom lay still, not yet near sleep. "Yes."
Nott hesitated. "Was that useful?"
Tom considered the question longer than Nott likely expected.
"Yes," he said at last. "But not because he embarrassed himself."
"What, then?"
"Because he now knows exactly how easy it is to do."
Nott was silent after that.
The answer mattered because it revealed something central about Tom's thinking. Humiliation, by itself, was rarely the strongest tool. Public mistakes faded quickly unless attached to a deeper self-understanding. Harry's humiliation in the library would be useful only if it taught him something stable about the conditions under which he failed. Tom suspected it would.
That made Harry more dangerous later.
Which, in the long term, made him more useful now.
In the learning space, Andros read some part of this from Tom's mood without being told the details. The old wizard had grown better at recognizing not just emotional changes but structural satisfaction—the inward steadiness Tom carried when a pattern clarified.
"You confirmed something," Andros said.
Tom was standing near the center of the space, one wandless exercise half-complete in the air before him. "Yes."
"That a boy made a public mistake?"
Tom's gaze shifted briefly. "That he can still be redirected by surface."
Andros's expression did not soften. "You speak of children as though they were tactical weaknesses."
"They are tactical weaknesses."
"No," Andros said. "They are children whose weaknesses you have chosen to read tactically."
Tom returned his attention to the suspended object. The distinction did not interest him much, but he recognized that Andros found such distinctions morally definitive.
"He will learn from it," Tom said.
Andros was quiet for a moment. "You sound almost as though that excuses you."
Tom let the object descend. "No. It makes him more accurate."
That was as close to respect as Tom gave easily.
Back in the waking world, Harry stayed awake much later than usual, replaying every step of the library scene with the merciless clarity that only embarrassment provides. He heard his own voice too loud in the quiet room. Saw again the Ravenclaw's irritated face, the Gryffindor's flushed withdrawal, Tom's maddeningly measured reply. But beneath the humiliation, another thought had begun hardening.
Tom had not looked surprised when accused.
Not really.
Measured surprise, yes. But beneath it, Harry now suspected, there had been something closer to readiness. Not because Tom had arranged that exact argument in expectation of Harry walking in at the wrong moment—Harry no longer thought Tom needed that level of constant control. But because Tom's whole method relied on people choosing the wrong frame often enough to protect the deeper one.
That realization did not make Harry feel better.
It made him feel later.
Which was somehow worse.