Giles: "In order to defeat Anyanka, one must destroy her power center. This should reverse all the wishes she's granted rendering her mortal and powerless again." You see, without her power center, she'll just be an ordinary woman again. And all of this will be, um, well, different. Well, I'd say that my Watcher muscles haven't completely atrophied after all.
Buffy: Great. What's her power center?
Giles: Um, well, um, uh... It doesn't say.
Buffy: Why don't I just put a stake through her heart?
Giles: She's not a vampire.
Buffy: Yeah? Well, you'd be surprised how many things that'll kill.
Giles: I don't want to kill her, Miss Summers. I want to reverse whatever effect she's had on this... this world.
Buffy: You're taking an awful lot on faith here, Jeeves.
Giles: Giles.
Buffy: Kill the bad fairy, destroy the bad fairy's power center, whatever... and all the troubles go away?