Arthur wanted to come back with some kind of biting reply. He wanted to come back with anything, but instead he just stood up. He pushed his hand through his messy blond hair and started pacing. "You... right." He said.
He took a moment to get his thoughts together before turning on Merlin to actually talk to him rather than just make a vague statement. "I know what it was, Merlin!" He snapped. "Since when could you do magic? Why the hell... If we were at home..." Arthur glared. "Dammit, Merlin!"