Yep. He was there first. I suspect the vampire attacked him unprovoked, because that's always how it seems to go with Harkin. I smelled blood, then him, and started running. Iris was there when I reached them, already fighting. I changed and jumped in, managed to distract him from snapping Iris' jaw off.

[ He didn't do nothing, but he's aware that they were extremely outclassed, even against an inmate. ]