Martin freezes as the girl's jaw drops. Clearly he is supposed to know her. Oh, god. He knew things were fuzzy when he first came to shore, but he thought he had a good handle on it and was remembering things far more clearly now. Who is she? She looks too young to be an old schoolmate, and he's fairly sure he never saw her at the Institute. An old neighbour or something perhaps that he's forgotten about?

He thinks it might just be a case of mistaken identity - a different person who looks kind of like him named Martin? Okay, a little coincidental perhaps, but possible. Except then she adds on 'different you' and that explanation isn't at all reassuring. Was he replaced like Sasha was? Is he doing the replacing, and doesn't even realize it? No, no, that's not possible. He's Martin, he knows he's Martin. Even if he was a squid before this.

"Oh. Um. A- a different me? I'm sorry, what?"