She can hear him, but distantly, like he's a long way aways (or just a memory).

It's a dream, Oswin, a dream you made for yourself...

She's run into this before, the crippling sense of unreality that makes it impossible to trust anything. She knows that sometimes its the feeling that's not real, not the things, but...

Right now she's not sure. She's not sure, and she's scrabbling for a way to be sure.