"Alright," the Doctor said, ducking to try and catch Fred under an arm. Provided that he succeeded, he'd help support her weight until they could get to a seat. "There's a chair in the next room."
He didn't mention that he didn't recall having met her before. The description of his previous face made him frown, but this was the same woman who'd sworn that the BBC had made a television program about him. It wasn't inconceivable that she'd remember or recognize previous incarnations. "Just hold on, Fred. One foot in front of the other."
Once they were moving in the right direction, he looped back around to answer her question. "It sounds like you saw my last face. Fred, what do you remember? Anything about the -- ah, Arkham? There are people still inside. I'm going to need your help to get them back out."