[Oh no, the kid's got his hopes up. Jesse holds up one hand.]

I don't wanna make any promises. I dunno for sure.

[Vampirism, in some worlds, crosses the line from physical to metaphysical. And he's never been able to stop magic itself. It would be an experiment, at best.]

And if he's the kinda vampire who's dead, then we'd need a human sacrifice to take his place. Which... ain't easy.