The change is so abrupt that it freezes him in place as she backs away. Why is she looking him like that? Why is she acting as if he might go rabid at any moment? What does elf mean to her? It can't be the same as what he knows. River said that elves were sometimes hunted to be slaves but could that really be it?

"Keziah..." he says uncertainly. "Whatever ploy you think this is, you're mistaken. This must be yet another difference in our worlds. I haven't the faintest idea what you are talking about. I am referring my girlfriend, River, who is here at this event now and in perfect health I assure you. It's not my place to offer her or any other person to you in such a way. Please, compose yourself. This must be a misunderstanding. I have no intention of harming you. My word as a vampire."