Doctor: History has collapsed. Whole races have been deleted from existence. These are just like after-images. Echoes. Fossils in time. The footprints of the Neverwere.
Rory: Uh. What does that mean?
Doctor: Total event collapse. The Universe literally never happened.
Rory: So how can we be here? What's keeping us safe?
Doctor: Nothing. Eye of the Storm, that's all. We're just the last light to go out. Amy. Where's Amy?
Rory: I killed her.
Doctor: Oh Rory.