Sympathy for the Demon

When Barbas, the Demon of Fear, returns to seek revenge on the Charmed Ones for banishing him years ago, he manages to trick Paige into making a potion that gives him a paranoid/hallucinating Cole's powers in order to trap the Charmed Ones in the manor and use their own fears against them: Piper's greatest fear is when good things happen, bad things ruin it, Paige's greatest fear is to be trapped and Phoebe's greatest fear is that she's afraid that she's Evil. The consequences devastate Phoebe. Cole decides to take his powers back to save Phoebe and the sisters make a potion to that effect. Using it and throwing it from puddle form like Prue has done, Paige strips Barbas of Cole's powers and returns them to Cole who vanquishes Barbas with an energy ball. Phoebe then rejects Cole again due to his evil powers being back.