Would you like me to find some way of proving it to you?

I'm sure it wasn't, though the fact that you find it necessary to tell me this sheds some doubt on that statement.

Are you quite ready to tell me who 'he' is, who he had, and why exactly are you this shaken?

[of course, he's already put bits of it together in his head. with more detachment then he would've thought possible, he wonders if this boy killed him.]