You'd know as well as me. [He grins at his other, reflexively, but the expression dies quickly. This could all be a lark, a new problem to solve—with himself, of all people—and the last time he worked with himself, together they'd saved a life that had been nothing but dust and memory—but something's wrong. His other—it's not panic, but it's like he's trying to run by everything around him so fast he won't see it through the blur. The Doctor knows running, knows why they do it. There's something here his other doesn't want to stop and think about.]

[It started the moment his other saw him.]

Yeah, that way. Second left after the calender room, three doors down, past the armor—[OI, that won't help]—armoire. The armoire room. Past that.

[If his other heads off in that direction, he'll follow, but at a distance. To see if that makes a difference.]