Cole: Phoebe? Emma: She has a baby? He goes over to Cole and gives him a look.) He's after her. I need to use the phone. Leo: Paige. Looks like one of Cole's, actually. Phoebe flips him over and Piper and Paige come out of the bushes. Phoebe: To find Emma. Piper: No, the only way to vanquish an upper level demon is with the potion of his own flesh. Ready? Someone might recognise you from when you posed as a DA. They also found this on the victim. They're sensitive creatures, you know. Who are you trying to kid? Upper level demon who likes to kill witches using an athame, sometimes with energy balls  His name, Belthazor.
Plan: A: Phoebe; Q: Who is forced to face a blast from Cole's past? A: one; Q: How many of Cole's past victims' widows are hunting him? A: vengeance; Q: What does the widow want? A: Belthazor; Q: Who is Cole's old protégé? A: the same athame; Q: What does the old protégé use to kill witches? A: Paige; Q: Who tries to convince her sisters to vanquish Cole? A: an instant mistrust; Q: What does Paige have of Cole? Summary: After pondering a marriage proposal from Cole, Phoebe is forced to face a blast from his demonic past when the widow of one of his past victims hunts him down, looking for vengeance. As a result, they're forced to face an old protégé of Belthazor's who likes to kill witches with the same athame Cole used to use. However, when Paige learns of this, she has an instant mistrust of Cole and tries to convince her sisters to vanquish him. Meanwhile, Paige helps Leo and Piper find out whether they're ready to have kids.