"Thanks!" Both to the compliment and the help with killing the thing. He finally lets go of it and eases himself up off it, carefully because of his injured arm. It's bleeding freely, along with the multiple scratches and gashes on his face from the damn thing's teeth, and he starts looking round for something to bind it with, to stem the bleeding until his super-fast healing powers kick in.
Not being able to find any thing to form into makeshift bandages nearby, he starts to pull his coat off so he can use his shirt, wincing as it pulls over lacerated flesh and glancing round at Spike. And yes, he is rather aware of the fact that he's bleeding right next to a vampire in game face, but for the moment he's going to ignore that and hope that Spike's sufficiently in control for it not to be a problem. "Nice teamwork! You okay?"