When faced with enemies that are sure to win the fight, Merlin only has one choice: expose his magic to Arthur and risk execution. In his haste to protect Arthur, Merlin accidentally kills all the men they were fighting, instead of simply knocking them out like he intended to. Merlin panics a little when Arthur confronts him afterwards. This is a Merthur Oneshot. I also have it posted on my Tumblr and AO3.