He'll keep himself in check — or, he'll try, but it's really difficult with such a strong smell of fresh, warm, human blood so close to him. Even more so since he knows what Jack tastes like and sure, he ain't no Slayer, but he's pretty damn close. Maybe that whole blue band idea could be put to use in other ways, later.
"Hmn? Yeah... yeah, I'm fine."
He pulls himself out of it after a bit too long of a pause, ignoring his own lacerated arm completely. Damn, that smells so good. He hasn't had a hot meal in... in forever and it's not like he'd even have to bite him. It's just there, wasting away drop by precious drop. Yeah, this game face isn't going away anytime soon. Damn.