Could see him taking an arrow wound in the shoulder to give an example, which would make it harder for him to wield that axe and therefore easier to grapple and pin down since he gets beaten when he falls under the weight of multiple Orcs grappling him. Another could be his leg since he has to use a staff after the years atop Thangorodrim, though that could be explained with him being really stiff from being stuck in one spot for almost 30 years.Huor will likely be killed by an arrow through the eye. And of course Boromir will be pierced by arrows as well. Do we want Húrin to be struck (non-vitally) by an arrow in his fight?