"...wait, what?" He was using that word a lot just now, wasn't he? "I didn't... I mean, I figured it out, after being here for a while, from the way your successor greeted me, that I never..." Deep gulp from his drink. Slow breath. Careful words. "I knew that I wouldn't see you again, unless it was a place like this." And also that he might be really actually for-good-this-time dead, but he didn't like to think about that. "But why..." He frowned, and looked at the Doctor closely. "You did something, didn't you. You did something that was just... infuriating and totally you and regenerated just after all that... that, didn't you?"