It... might be. I know part of why he refuses to listen to reason, now. The castle itself is a creature of chaos - it makes him unable to see reason, when he is fully under its influence. But only he can enter its heart...

[Another sigh.] Which is, I suppose, another way I can prove who I am, since I can also get in there. I don't relish the idea of doing it again, but if it would give you and the others another chance at convincing him to set aside his grudge, at least while he's here... I would do it.