Alexios DID get carried away. In his defense, it was only the second time he had tried to feed, so that did have something to do with it. He jerked his head up at Damon's voice, still bloody and he flinched, more at the tone than the words, but he did nod slowly, and backed away, then glanced at what had happened and, Well. Oh.
He saw the reason for that all right and he stepped back, tucking his hands into the small of his back, though he did make eyecontact as he came back to himself.