"Well, that puts a whole new light on things." The Doctor ran a hand through his hair, pacing abstractedly. "If we can remember things when we return to our real lives, then what we do here does matter. Yet some people definitely haven't remembered this place when they went home. How to make sense of that? Need to gather more data. Need to find out who does remember and who doesn't. Need to find out it I might remember."
He suddenly remembered Lane, and came back to him with a slightly sheepish grin. "Sorry. That's rather an exciting revelation."