[One can't be in a place like this for long and not be used to magic, at least in a way, but the light still makes his eyes widen for a moment, before he focuses on the creature-- and, look, the monster is suitably distracted, and when it rears back as the blast hits it, Gwaine moves close and cuts its head off with one, clean strike.
... well, that was easier than expected.]
You have my thanks! [He grins at her as he kneels down to inspect the monster's head.]