Talk:Pathokinesis/@comment-67.185.176.32-20130928061718/@comment-173.183.190.42-20150821011852

You are right, actually. Vampires are specifically in canon without any of their own blood or circulatory system. Even more relevant, their cells do not divide. They have no endorphins or hormones that Jasper could change. He shouldn't be able to affect vampires unless it's in the brain. Of course, no one reads these books for their stunning scientific accuracy, so I wouldn't worry about it too much.