Lan Wangji doesn't know how to answer that, and so he doesn't, not for a long moment. He looks at Magnus with the blank expression of pure surprise. "I don't know." That sounds like a useless answer even to his own ears. He has listened to Claudius talking about his trauma and the workbook he is using for it; he has investigated the definition of Post-Traumatic Stress Disorder on his own time. But it has hardly occurred to him to think of himself in relation to it.