Death has to happen. Thats what bein alive is all about. Youre alive, and then youre dead. It cant just stop happening.
But it can. And it has. So what happens after death is now less of a philosophical question than a question of actual reality. On the disc, as here, they need Death. If Death doesnt come for you, then what are you supposed to do in the meantime? You cant have the undead wandering about like lost souls. Theres no telling what might happen, particularly when they discover that life really is only for the living