He didn't necessarily unnerve her -- the visions were doing a well enough job of that on their own -- but something about him seemed a little bit...off. She didn't know how or in what way, but when he revealed to her that he was called Graverobber, she honestly wasn't surprised.
"Graverobber, of course," she replied, smirking ever so slightly at the irony and watching him closely at the same time. Heather wasn't the most trusting person in the world to begin with, so it didn't help that he was watching her with such obvious curiosity. She was still trying to figure out what was so odd about him, other than the way he looked and his name, of course.
"How do you get a name like that, anyway?" Why not ask, right? She could be curious, too. And in a way, she kind of was.