Simple bio mechanics so: the leverage and overall force are the same in zombie body (ignoring voodoo magic) as they are in human one, intentional injuries and h

Simple bio mechanics so: the leverage and overall force are the same in zombie body (ignoring voodoo magic) as they are in human one, intentional injuries and hoing beyond the pain limit nonwithstanding. And zombies are, again ignoring voodoo, well, rotting. That means less tensile strength of muscles and such. And even without all that, a himan cannot use his fingers and teeth to tear another human, well, we know the films. The human body simply lacks the necessary tools: claws and fangs. As the sibling pointed out, just rolling with all of that is also fun!