[Accidents. Yes, that's what they were, especially given that Toby's powers are in fact different from the ones he had back home. But both he and Dorian agreed not to tell anyone else, instead maintaining the story that his inability to feed without siring is part of how being a vampire works where they're from. No one else needs to know.

After a moment's silence,] Thank you. I've been trying, after all.

[Still, though. This doesn't tell Toby what Edgeworth wants, or why he'd wanted to know.]

So you've decided what sort of person I am. If I might ask, what for? I mean, why did you want to know?