"Charmed: Hell Hath No Fury (#4.3)" (2001)
Phoebe: Well, because she's our sister.
Piper: Not for long.
[Piper and Phoebe run out of the attic]
Cole: [Cole grabs a chair and sits down]
Phoebe: [Phoebe runs back into the room] Are you coming?
Cole: To vanquish your sister?
[laughs]
Cole: I think I'll sit this one out.

Phoebe: Cole is not your problem, Piper, and you know it.
[They fight]
Paige: Book!
[the Book of Shadows orbs to her]
Paige: Please let there be something in here.
[Cole conjures an energy ball]
Phoebe: Cole don't! You think I abandoned you. You think it's my fault that Prue died....