Orcs have no magic. Warcries.

I looked at the Orc hero's skills and found where the clenched fist is shown (mages have a magic mirror), and IMHO, does this mean that Orcs will have some kind of resistance to the magic mirror?:eek: Orcs don't like magic, so why would they need to cast spells? Or is this an improvement to magic resistance??? Help me out!