"Yeah, no kidding. So, uh, this last spring I was in a car crash, lost a leg." She knocks on the side of her right calf; it makes a not-flesh noise. "And like the crash itself was pretty bad but I don't supes mind being a cyborg, and I cannot emphasize enough how little I care about high school popularity contests but it was looking like I was going to get prom queen because everyone felt bad for me or whatever. Other people care - more, about high school popularity contests, apparently, and one of them in particular cared a whole lot, and happened to be a vampire, and for vampiric reasons decided that the solution to this was to rip my throat out with her teeth." She curls into herself a bit tighter and puts a hand on her collarbone.
"Uh, I don't know if vampire media is different in your world, but - that's the sort of thing that you'd expect a fictional vampire to do but not a sane real one; if I drink somebody's blood straight from them without an intervening vessel then they get magic too - that's why I specified it should be in a glass earlier but it didn't seem worth getting into when you were going to be dead soon anyway - and magic is very helpful about letting you know what you can do with it. And there are safeties for malicious intent for pretty much anything you can do to other people but not on the mind control -
"So I spent everything I had on making her like me and care about me, and apparently this either saved not only my life but six others, or you guys were lying to me about that for flattery or whatever."