A Zen Master disciple, Yen Lo, is mortally wounded by the Zen Master's daughter, An Ling, when he tries to kill her father. Yen Lo vows he will be back to kill both the Zen Master and An Ling. He enters Limbo, where his wound will not progress, and his physical body will remain alive.
At the manor, Phoebe is training in martial arts with Cole to prepare to fight the Source. Meanwhile, Piper is teaching Paige about potions and preparing her for a quiz. However, Paige feels that going out and fighting demons is more important than sitting and studying. Piper warns her that one mistake can hurt someone, then leaves to get more ingredients at a Chinese herb store. Standing over a boiling pot, Paige adds ingredients at random, then wishes she were able to fight like Phoebe. The potion causes Paige and Phoebe to switch bodies. Not wanting to make Piper any madder at her, Paige convinces Phoebe to not tell anyone what has happened, and the two pretend everything is normal.
At the herb store, Piper meets An Ling, who is trying to get the dragon blade, which will remove Yen Lo's soul from his body so he can move on. Piper agrees to help An Ling fight this evil.
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