the catholic imagery (purgatory is a catholic concept), the little story about the cat that wont die, the indian spiritual "guide", and in the movie they finally come out and say it at one point when vincent (that was his name right?) was explaining things to faye. in the fansub i saw he actually used the word purgatory (though i havent really checked to see if that was just a translation or the actual word he uses). there are a number of other little hints throughout the story line, including when julia meets him in the graveyard, when vicious had spike shot in the place with all the snow (man its been a long time since i watched bebop

; ), in the episode where spike killed the "kid" who was actually an old guy whose body never ages, and in general, it explains the reason why both spike and vicious were so bold throughout the series, doing as they pleased without the slightest fear of death. neither of them could "die" till they had taken care of buisness, and then they could only kill each other.