The deal was supposed to be that if we participated in this study they'd grant us any wish we wanted. But then when we actually got there they said they didn't have enough resources to grant everyone's wish, so I think maybe two of them did it because they wanted to take out enough competition to make sure they'd get theirs? And one other I think might have just been a fear thing since other people were dying.

But I think the two the vampire did were just because he was a vampire and a jerk.