In the show, Magic got exposed when Prue and Piper vanquish a demon, Shax, outside and a couple of reporters caught them and filmed them using their powers. Not capable of dealing with the situation, the girls had to make a deal with the ultimate demon, The Source of All Evil, to turn back time. After they had reseted time, Shax attacked and mortally wounded both Prue and Piper. Leo could only save one of them so naturally he saved Piper, his wife. In real life, Shannen Doherty left because she and Alyssa Milano weren't getting on and she didn't want to work with her any more, also she and the producers had struggles.