(She uses her power and slams Phoebe against a wall.) (The Whitelighter's crossbow appears and he shoots for Piper and Paige. And if I have to hunt down and kill every demon in San Francisco to prove it to you, then that's what I'm gonna do. Another charge is in trouble. Control them. Leo: No, look. Piper gets off Cole and Cole lets go of Phoebe. Save me from having to sing for their husbands. She strokes his face. Siren: I want them to find me. So the fact that Melissa is a future Whitelighter might be just a coincidence. Walk a mile in each other's shoes. [Cut to an alley in France.
Plan: A: A Siren; Q: What arrives in San Francisco? A: couples; Q: Who does the Siren target? A: Whitelighter; Q: What is the future husband of a Siren? A: her sights; Q: What does the Siren set on Phoebe and Cole? A: a way; Q: What do Piper and Paige have to find to keep Phoebe and Cole from dying? A: an argument; Q: What happens between Leo and Piper? A: their unborn baby; Q: What does Piper and Leo have that uses magic? A: its magic; Q: What does the baby use to make Leo and Piper swap powers? A: a mile; Q: How far does the baby want to walk? Summary: A Siren arrives in San Francisco, looking to cause trouble for couples. After she kills the husband of a future Whitelighter, she sets her sights on Phoebe and Cole, Piper and Paige have to find a way to keep them from dying. That proves to be tricky when, following an argument between Leo and Piper, their unborn baby uses its magic to make them swap powers, in an attempt to walk a mile in one another's shoes. Cole continues in his quest to prove to Phoebe that he's no longer evil.