Thanks a lot!

I hadn't actually heard of that story, so I googled it. Sounds like a great story, I'll see if I can find it someplace. Based on the description on Wikipedia, though, I'd say there's a difference in that in this story Dana isn't required to be who she is in order for the Slayers to work - at least not technically, as in they would lose their powers if she were sane. Metaphorically and mythologically, though, is a different matter... We humans like our sacrifices.