@starlightcitypro I dont think so, he is just accustomed to the bodily characteristics of vampires, and he has an uncanny perception for certain things.
@newmangareader246 I think she's just some other vampire his friend has been running into since before he actually knew about the vampire stuff. I remember people joking about how it looked like his friend was gonna turn before he managed to despite actively trying. He appears to have realized what she was when shaking her hand, and she appears to have smelled the other vampires on him, so here we are.