I dunno if they're your lifesource- I'd say it's more like if you try to rip off your own head. Errr, for you humans, I mean. It ain't the same for me, because I can rip off my head just fine. But you know what I mean, right? [He pauses for moment, thinking.] Hmmm... Or maybe they are what's keeping you alive here. I forget what the newcomers' guide said about these things.