"I...don't know," Buffy answers honestly. "Marcy. I remember Marcy and I hope not because she wasn't very nice." She'd sort of tried to disfigure Cordelia and kill Buffy. "You're not going anywhere, Dawn. You're not going to turn invisible and you're not going to disappear. I'll stop it before that happens, okay?"

And she wouldn't sleep until she'd figured it out.