He. Really couldn't do more than stare. Still. The silence was a good thing. It gave him some room to try to process. "There is only one Time Lord left. I can't have come back with another one. ...You don't mean the Doctor's gone mad, do you?"
...Jack would eventually stop having problems with this. Really he would. Maybe.
There was another long pause, then he snorted and answered Owen's question. "Yeah, I meant so little I died to clean up your mess and save the world."
...Destroyed the world. Slaughter. Sociopaths. What the hell.