"That," he says, with perfect truth, "had not occurred to me."
"Is turning orange a necessary quality of the end potion?" he turns it back on him.
"No; I've visited them before, long before awaking here. Around '76, I think, and once or twice in the nineties."
"I'm saying outright that I don't believe you've conclusively determined whether he is or isn't," he counters, raising an eyebrow. "Don't neglect your native House's lessons as you diversify; they have limits but are basically sound."