Sorry Meg; Castiel was not about to get in the middle of things, especially when Dean couldn't understand his signing. There was little to no point in it, and he was pretty sure the demon's feelings weren't going to be that hurt by Dean being Dean.

That said, she certainly looked unhappy, but she was also getting impromptu surgery.

He did offer Meg a sheepish look at her expression, but returned his focus to what Dean was doing. He listened, taking note of everything he said and did, eyes sharp and intent even though this whole thing looked incredibly unpleasant both to do and to have done. He was unsure of what Dean was wanting when he held up the bottle and the rag, but he reached to take them and set the to the side; he figured they would be needed again during the process, and that that was his responsibility.

He then set his hands gently on Meg's collarbones, so as to be able to hold her without obscuring Dean's view or ability to work on the injury, though he was pretty sure he wasn't going to be able to stop Meg from moving if she wanted to. She was the supernatural being in the room, after all; he was just as mortal as Dean, but he would do his best.

Castiel did know, from experience, that digging out bullets hurt.