Suyin had passed too, which she reported with the matter-of-fact certainty of someone who had known she would and considered reporting it a formality. What she was more interested in was the Hou Beng incident, which she had observed, and which she had then spent two days analyzing from three different theoretical angles before she brought it to Kai.
"He pulled from your output field," she said. They were in the outer library's back corner, which was theirs by informal agreement. She had a diagram spread on the table — a rough rendering of the assessment hall's spatial formation grid with her annotations in the margins. "The infirmary report lists it as spiritual turbulence from absorbing impure ambient qi. That's the official explanation."
"That seems accurate," Kai said carefully.
"It's accurate as far as it goes. What it doesn't explain is why your ambient qi field was impure during a sustained clean-cultivation demonstration. If you were running the technique correctly, your output field should be standard purified qi. What Hou Beng absorbed was not that." She tapped the diagram. "I've been trying to identify what it was. The infirmary described his reaction as emotionally destabilizing. Spiritual turbulence doesn't typically cause that. It causes exhaustion and meridian irritation. Emotional destabilization suggests he absorbed something with a — a content."
Kai was quiet.
"What does your cultivation feel like," Suyin asked, "when it's running deep?"
He considered how much to say. He trusted her, or had begun to, which was a process not a state. "Dense," he said finally. "Like there's more material being processed than a standard output field should contain."
"More material from where?"
"I don't know."
She looked at him with her cataloging attention. "You know," she said, "most people would have a simpler explanation and be wrong. You don't have an explanation at all, which suggests you've looked at the data and found it doesn't fit anything. That's more honest."
"I find it less comfortable than you seem to."
"I find it intensely uncomfortable," she said. "I'm writing it down because writing it down is how I make it feel like something I can work with rather than something I can't." She rolled up the diagram. "I'm going to run a comparison study. If I track your output field data from the assessment records and compare it to the standard deviation for outer disciples at the same cultivation stage—"
"Suyin," he said.
She stopped.
"Don't document this formally," he said. "Keep it in your personal notes. Don't create a record that connects your name to any irregularity in my cultivation."
She looked at him steadily. "You think it would be used against you."
"Against both of us," he said. "I don't know what it is. When I know what it is, I'll tell you. Until then—" he gestured at the rolled diagram "—keep that somewhere no one else finds it."
She held the roll for a moment. "You already know it's something," she said. "You're not confused about whether something is wrong. You're confused about the mechanism. That's a different problem."
He said nothing.
She kept the diagram. She kept it in a false-bottomed ink case that she'd built for the purpose at age twelve and had been carrying ever since, in the practiced certainty of a person who had always known she would one day need it.
Outside the library, the outer cultivation yard was full of the ordinary noise of sect life. Someone was running laps. Two senior disciples were arguing about a formation technique. The sky above the sect had, in the eastern quarter, a very fine dark line running through the clouds — hairline thin, easy to mistake for a shadow — that the sect's younger members occasionally pointed at and that the older ones had stopped seeing the way you stop seeing the furniture in a room you've lived in for a long time.
Kai did not see it either, yet.
He would, eventually.