Castiel had been expecting this. He knew that the man would wake up and be exceedingly angry - drying did that to people. He had been watching him cautiously, waiting.
When Damon took a deep breath and gained his bearings, Castiel braced himself. When Damon launched himself, Castiel teleported himself to the opposite side of the room. "You need to calm down," he said with mild passion, staring at the vampire's back. "I saved you."