Merlin is human, probably. He thinks so, anyway. He breathes like a human. Inhale, exhale. If he were immortal then he wouldn’t have to breathe, right? So that there is proof he’s mortal and human.
Except for the rare occasions when things are so chaotic and busy and they’re all caught in the middle of battle, and Merlin forgets. Just for a few moments he forgets to breathe, forgets he has to - until the battle is over and he looks around to see his friends panting with exhaustion, and becomes so unsettled by the stillness of his lungs that he works himself up into hyperventilation.
