[Rune Son of Bjarne]

Why?

Did you not notice that Aragorn chose to catapult him self at the Uruk, instead of simply stabbing it and be done with it. The Uruk somehow manages to throw a shield that gets stuck in a tree trunk, and at the same time has a strangle hold of Aragorn. When Aragorn finally pierce the Uruk with his blade, it simply starts pulling the sword further through its torso in order to get a shot at French-kissing Aragorn.

So we have Ranger that gives his adversary a warning shot, before starting the proper fight. On the other hand we have an Uruk, capable of precision hurling shields at moving targets, and that doesn't seem to be moved by pain or its own impending death.