The Magic Explanation is for those that don't have a brain like you Clepy
But seriously, I agree more with Cleppy here then anything "magical"...
I dont see Kobal Casting Shield on his Mithril Armor when he makes it. Lord of the Rings is a great example. Mithril "Light as a feather, Hard as Dragonscales" stops a huge spear from stabbing Frodo, but KNOCKS HIM OUT in the process. Sure it didnt go throw him, but he still got hit with all that Force. Every wear kevlar and get shot? It still freakin Hurts, even if you arent gonna die.