I'm looking for a word or a short phrase describing someone as particularly skilled or gifted, or very likely to hit one's opponent, in mêlée (single) combat.
- It mustn't be specific to just one kind of weapon.
- It mustn't be about pure physiological traits such as strength or speed.
- It mustn't be extremely colloquial (i.e. "badass" won't do).
You could say I want the mêlée version of marksman — which you could use for throwing knives, shooting a bow, or firing a gun.
To put it as the "blank" a sentence:
You are quite the ________ - you took him down before he knew ow what hit him.
which should be the equivalent of
You are quite the marksman - you got him in one shot.