[He's certainly off at a fast clip, and with ten inches of height on her, his legs are far longer anyway.]

While I commend your curiosity, it's not really the time or place. Suffice it to say that he was a good friend of mine but he's no longer with us. His work, however, has outlasted his involvement with our cause, and for that I'll always be grateful.

Just who are you?

[The question might be brusque, but he doesn't ask in a snappish tone, so at least there's that.]