Lan Xichen has just done the unthinkable, and slapped his uncle into silence, after repeated entreaties failed to work. Lan Qiren gapes openmouthed at him.
"Uncle," he hisses. "You will shut the hell up about A-Zhan's child. The official story, which is a lie, is that Wei-guniang caused the pregnancy by accident while working on related talismans. Lying is against the rules, and you and I will go along with it anyway, because the truth is that the child was conceived some days earlier, while she was in Wen captivity."
Lan Qiren freezes and goes pale. He is remembering what Wen Xu said to her, when she had just given herself up.
"Yes, Uncle. This child happened because A-Zhan chose to make an incredibly painful, selfless sacrifice for the sake of our sect. Now get the hell out."
He gets the hell out, looking, for the first time in anyone else's memory, horrified with himself.