this episode be not incoherent like another person say . the source agree to help because he be not go to keep his word and if you pay attention . he say after she ( phoebe ) agree to stay down there in hell and get rid of her and balthazor so i dont have to worry about them in the future . and also and he do not let cole warn the sister like phoebe ask in exchange of accept the deal and that why prue die and because she get hit hard than piper and on the head and and there be no phoebe to call for leo this time and and in the past leo say that she almost get herself kill . pay more attention next time . and there be not a to be continue . after this episode . it be the end of season 3 and and on season 4 they can not show anything from prue because she own the right of it prue and so the producer would have to pay her for whatever they show . this be the last episode she be in .