His hair or whatever else could power anyone from this world up and all. But as we saw, someone powered up by a human artifact was brushed off like a non issue by him lightly tapping them because he thought they were an actor. She doesn't seem dumb enough to actually try anything like set up a future betrayal given everything she knows about humans and what she just saw. Besides, she was totally Indiana Jonesing out there. That hair belonged in a museum, not someone's stomach. Someone with her level of interest in human artifacts isn't going to give up the chance to observe an actual human in the flesh.