*apologizes at, quiets down to a dull roar* [He walks in silence for several minutes, considering the question, and Roxas' sketchy explanation of events. He knows the what, but not the how or the why--perhaps Axel is a more fitting person to ask. Treetops can be seen before he starts speaking again; he's headed for the park.]
I recall only being at the Castle for a few days. Sora and Riku had arrived, and Vexen had just finished his Replica.
[He doesn't sound accusatory, so much as just serious and thoughtful, earnestly curious. Even with all of this on his mind right now, no matter what the answer is.... he wants to know. He wants closure, for these shadows of non-existence that have been lost, for the people they had once been, for the people he knew as comrades.]
What do you remember before this place, Axel? I hear that you alone managed to escape Castle Oblivion. Why is that?