Unfortunately, desperately attempting to tear yourself from your partner's grip when he's holding you close and literally hunching over you is bound to have some unintended sideffects. As Carlisle twists and struggles, his knee drives right up into the alien's throat; Glacius gives a startled, pained wheeze as is major airway is struck, falling to his knees--though to his credit, he does not drop his partner painfully to the ground. One hand stays around the clergyman while he brings the other up to his injured throat, rubbing at it as hacks and coughs.

Should Carlisle want to get behind the alien's bulk, he'll be able to slip the rest of the way from his grasp to do so now, though it... might not offer as much protection as it usually does when he's bent over like this, trying to get some breath back.