Dean went to give Sam the chalk, his eyes flashing quickly to Jo. She looked alright...at least, she didn't look seriously hurt. It was one thing that he admired about her, she gave as well as she got, and the punch that she aimed at the possessed man looked like it stung like a bitch.
He stood at Sam's side, surveying the demon with cold eyes. It was clear that, as he started this, Sammy was in control of this exorcism, but that didn't mean that Dean was going to stand calmly by and wait for his little brother to instruct him on how this one would go. He wasn't going to let Sammy hold the thing there by himself. "Now, let's send this thing back to hell where it belongs. I don't care if it's possessing a human or a goddamned yetti, I want it gone. NOW." As if to emphasize his point, he pressed the barrel of his gun into the demon.