If Corwin knew the specifics about vampires, he might have altered that statement-- or he might not have, depending on the vampire lore he's told and how violent and anti-human he decides they are. But at this point he doesn't know more than "other non-human things exist", so he's stuck with what he can think of.

When she finally moves, he holds his breath, staying as still as he can. At her touch, he exhales again in something like a soft chuckle, and offers her his hand again, the first step to attempting to touch her, back. "I have no idea if you understood any of that, or if you're just the strangest animal I've ever come across. Either one would be all right, I suppose."