V's response catches him a little off guard, and he has to think about it for a moment. Is it possible, maybe, that V doesn't remember all of what happened? That seems like something the stupid fox would do.

"What's the last thing you remember?" he asks, going off the hunch. At least it should prevent him from saying anything else really stupid, or... dropping any truthbombs he doesn't mean to, come to think of it.

"Did Vergil catch you up on everything?"