"Yes, he's in bed." Merlin nodded, ready to say good night, and go back to his previous plans of a bath and bed feeling much more awkward about the whole thing. Instead she wanted to talk to him, which caught Merlin off guard. She hadn't gotten the chance to be angry at him in person, though it was a little late to be doing that now, but she didn't look all that upset either. As for the alternative, Merlin had pretty much resigned himself to the idea that she wouldn't ever forgive him.
"Me?" He glanced back at Arthur's closed bedroom door, and then stepped back so Morgana could come in. "Oh - Ok."
Merlin stood to the side, and rubbed the back of his neck, more then a little nervous. Maybe there was something wrong. Something he needed to know about Arthur or Gwen, and she was just passing the message. Maybe she just had more questions about that whole incident because he was pretty sure he hadn't made a whole lot of sense when he tried to explain everything in a panic. Not that he wanted to explained much more because he had a way of doing it that just made himself sound worse and worse, and just saying 'I really was just trying to help' probably wouldn't be an acceptable answer.
He knew how to do one thing though. Shut up. With Arthur it was different, he talked and rambled when he was nervous and trying to hide things because if he was too quite the other would insist on knowing why. With Morgana -- It just seemed better to be quiet and let her talk. She was more intimidating then the prince, honestly, and he was already on her bad side. It wouldn't do any good making it worse with his chattering on.