It was in the depth of winter when Chen Yi first noticed that Elder Sun's hands shook worse in the cold.
He had noticed the shaking before — it was present in moderate temperatures, the fine tremor of someone whose qi circulation in the extremities had been compromised. But in cold weather the shaking intensified in a specific pattern that he had been observing and cross-referencing against the Compendium's section on forced breakthrough injuries.
The pattern matched.
Someone had pushed Elder Sun's cultivation past a safe threshold, rapidly, without allowing proper consolidation. The damage to the peripheral meridians was consistent. The timeline, extrapolating backward from current degradation rate, was approximately fifteen years.
He was sitting across the desk from Elder Sun on a cold Tuesday afternoon, watching the tea pour shake slightly in the old man's hands, when he calculated it.
"Someone forced a breakthrough," he said.
Elder Sun set down the teapot.
"You said you made a mistake," Chen Yi said. "That a student died. But the injury in your hands is from someone else's forced breakthrough applied to you, not from cultivation damage accumulated over time." He paused. "Who forced your cultivation?"
The study was cold. The small brazier was doing its best.
"You're observant," Elder Sun said. Carefully.
"Who."
A long silence.
"The sect leader at the time," Elder Sun said. "He believed I had the potential to reach Void Realm if pushed correctly. He was correct about the potential. Incorrect about the method." He looked at his hands. The shaking was very fine right now, barely visible, but present. "The student who died was my student, yes. But she died because my damaged meridians, which I didn't know were damaged at the time, transferred an incorrect technique."
He set his hands flat on the desk.
"So the mistake was yours and not yours," Chen Yi said.
"Both," Elder Sun said. "The mistake was genuinely mine. I taught a technique I should have understood better. But yes. The foundational damage that made the mistake fatal was not mine."
Chen Yi processed this.
"The sect leader," he said. "Is he still—"
"An elder. Senior. Very respected." Elder Sun's voice was absolutely neutral. "He has not, to my knowledge, been held accountable."
Chen Yi filed this.
Not for action. Not yet. Just filed it, the way he filed things that needed more information before they could be correctly categorized.
"How long do you have?" he asked.
Elder Sun blinked.
"The degradation rate," Chen Yi said. "I can calculate a range but I don't have your full cultivation history."
The old man looked at him for a long time.
"Ten years," he said. "Perhaps twelve."
"And you haven't looked for a treatment."
"I've looked." A pause. "The techniques that could address this degree of meridian damage are—"
"Above Foundation Establishment level," Chen Yi said. "I know. I've been reading the same Compendium." He looked at the old man's hands. "I'll reach that level."
"Yi—"
"I'm not promising when. I'm stating a fact." He picked up his tea. "I'll reach it. By the time I do, I'll have a technique." He drank. "Don't die before I get there."
Elder Sun stared at him.
Then, slowly, the old man did something Chen Yi had never seen him do in the months of their acquaintance. He laughed. Not the polite laugh of someone responding to something that wasn't quite funny. A real laugh. The kind that had surprise in it.
"That," Elder Sun said, still laughing quietly, "is either the most arrogant thing I've heard in forty years of cultivation, or the kindest."
"Both," Chen Yi said. "Like most things."
Elder Sun shook his head.
But the shaking in his hands was slightly less, somehow, than it had been before.