That loosened GOB's grip a bit, but his teeth were still in the arm. It actually took him this long to realize that he had Atton in a good position for a more conventional attack as well as getting his suck on, and yes that's how he phrased it in his head.

Since he wasn't really going to turn his head right now, GOB lashed out blindly with a vamp-strength punch somewhere in the vicinity of Atton's chest.