[quote=Thanatos]
If he gets let say punched in the face from the front, then his head will be "pushed" backwards, because a person is applying continuous force, the distance of how far back his head will move depends on the strength of the person. While a bullet, we can say is just one giant blast of energy, so it will stop after its kinetic energy is absorbed.
[/quote]

What I actually wanted to know is if it will damage him? Cuz nearly every physical attack can be considered kinetic.