Henry could, actually, answer the 'likely how.' Given that it was supernatural, some of the things he's been uncovering have given him cause to believe that this might have been one of the ones he was looking for. But then Jackson goes on, and the point doesn't matter.

"I'm working with the nest on behalf of the Redbright Institute, yes." Part of the outreach, almost like an ambassador. Because, apparently, an immortal was the best candidate for talking to vampires. "Since you said 'a third'... You've had another vampire corpse?"