Huh... I was sure that Ra was a red herring, that she'd be a vampire but not the vampire... at least when I wasn't sure that she and Tish were in cahoots. I guess the latter could still be true...
This is getting serious pretty fast. I initially thought that despite Leo's obvious suspicions, Ra would come up with a good cover story, and they would nurse her back to health (that could actually have been quite funny, if everybody disregarded the blatantly obvious). Now, however, an outright attack from Ra would probably gloss over the moral dilemma that killing a customer is probably bad for business. Given that a visibly distressed Tish and freshly-recovered Leo actually stand a chance, of course.