[He doesn't say anything, can't say anything, his eyes wide, almost too much so, staring at something only he can see-- taking in all those memories, all of their family dying, one by one, their aunt as the last in this very room, the realisation that it was all because he hadn't listened to Kamui, hadn't been as cautious as he should have been, and now they're all...]
... It was all my fault. They're all dead, all of them, and it's all because of me. [The words are quiet, almost toneless, as though he can't quite process this through the shock, the overwhelming guilt that is so heavy, so much a part of him that he can't believe he could have forgotten.]
[He reaches out, touching the bloodstains that cover the floor almost gently, before he lifts his head, his eyes finding his twin's, and this time, when he speaks, his voice is louder, the question absolutely sincere.]
How could you have ever forgiven me? [He can't have ever forgiven himself. Even if he doesn't remember what happened afterwards... this much he knows.]