[Luca sat for a minute, considering his question. All of this information had been a lot, and he hadn't known how to feel about it. But, he supposes, figuring that out and figuring out whether he should be concerned all starts with the why of it all. So he asks.]

So...why did you do it? Why'd you kill that guy?

[He hesitates, then adds...]

The killing someone thing...it's not something that's likely to happen again, is it?