Buffy: I had a dream, Giles! Angel came to me and said, "Something's coming, Buffy, something big." Then the Hellmouth opened. My god, Giles, they're going to open the Hellmouth!
Giles: But who, Buffy? Who's going to open it, and how?
Buffy: Dawn, they're going to use Dawn.
Giles: Then there's only one way to stop it...
Buffy: Yes, I know. I have to kill Dawn.