Well, at least you admit he is human, unlike some people. You have to understand though that he was hit on the shoulder and it grazed his ear, pulling it off. It makes sense and is physically possible. Like someone here said, they saw a man get his scalp torn off by a bull to the point off it hanging off his head(!) and he was still able to get up and walk away. And if you've seen the special edition, he grasps his ear, blood squirts out, and he winces in pain.