If he does the same thing he just did, the salt block in the monsters mouth, he can literally kill any living being if he has enough salt, talk about op.
Because the thing's much larger than him, denser, has armor-like fluffy feathers, all of which helps cushion and spread out blunt force trauma, meaning you have to be THAT much stronger to kill it with a good hit of a hammer. A piercing weapon requires less strength to push it through permeable objects and flesh/bone. But still more than he had, sadly.