There's a long pause at that as he tries to... figure that out. Charlie's a brave, stubborn woman, so why would she...? Arthur told her how he died, of course, because knowing that idiot he's blaming himself completely when there's no single way that he could actually have wanted to do that.

It was the City, that's the only explanation. But he can't really see why Charlie would leave because of a curse that made Arthur kill him. So... then what?

"Why?"