For someone supposedly 100 times stronger than a normal human, he takes a lot of damage from a trip down the stairs. (Also, suddenly lolified more than Mickey in this scene...)
Half-elves have explosive strength, without the long term endurance or durability of beastmen. So he can use his freakish strength in short bursts, but not in things like long distance running or lifting.
Come to think of it, it's possible that he could tear a muscle if he push too hard. Luckily, there's Roland.
