Cosima has been very quietly sitting in the corner of her cell. Not in shock, exactly, though those who can see her might easily mistake it for that. She's been thinking, working through a lot of information she doesn't have context for.

"Doctor," she says, suddenly, as if they're having a very natural conversation that isn't at all taking place in prison cells full of angry and confused fellow prisoners. "Doctor, when things like this happened to you before ... did you stay in one closed timeline, or was it more a many-worlds deal? Could you change things?"