Galahad frowns slightly, that minute pulling together of his brows. He doesn't want to argue with Magnus and be wrong, but he has been learning from Lan Wangji for so many months, and Lan Wangji is always a patient and attentive teacher; he was gentle from the beginning, even the very beginning, when Galahad was someone else more capable of being sullen and contradictory. "You're wrong."