It's a bit long, but I had to do it. Let Merlin get his anger out.

Background: Merlin discovers a time reversal spell, at the same time as being in what Gaius called a 'spirited debate' with Arthur.

Arthur rubbed his eyes and sat up on the bed. Merlin stood by the window, fixing the curtains so that they sat straight.

"Morning, clot pole," he said, turning to face the prince.

"Shut up, Merlin," Arthur hissed, standing up and fixing his hair in his mirror.

"Yes, dollop head..." Merlin sighed.

"Merlin!" Arthur moaned.

Merlin raised a concerned eyebrow in fake interest. "What seems to be the problem, cabbage head?"

"What is wrong with you today Merlin? You're being really unusual."

"Nothing unusual about me, your royal pratness," Merlin said, suppressing a dangerously large grin, "Just another day for me and you."

"Not exactly..." Arthur let his sentence trail before picking it up again, "that sorcerer's getting executed today."

Merlin threw down the towels in his hand. "You actually want to let this man die, you supercilious-"

"YES, MERLIN!" Arthur intercepted, "He's dangerous. Every magician is. And stupid if they keep practising it. I mean seriously can't they just stop? What's the point?"

To which, he meet a firm fist in the jaw.

(But of course, that never happened... )