There is no spell

[Fake Shemp]

i liked it, and im glad they didnt wallow in it on the show (theres so much in this show that if it was on another show would take forever to come out or actually happen)

 

[Xin Rong]

I always thought it was fairly clear that there really wasn't any spell and Giles was using it as a way to get buffy to talk about what happened...