It's a possibility. [The Doctor doesn't speak any more about it, because it's still a sore point for him - his helplessness here, and everyone who has left the island who he could save. It didn't help that he didn't even know whether or not they even needed saving.

He cheers up immensely at the change of topic.] Oh, so you've already met me! Well, past me. Well... past me separated from the timeline I remember.

I should really find a better way to refer to me. Him.