Mmmm hardened wood, hitting on the the metal parts, besides noone block like in Warband IRl, that's dumb.
Edit: You don't even need a 2 handed sword, I've done very scientific test on wooden pole using a sharp arming, friend held the pole in the air, I smashed, it broke, but that was shitty wood, you could break the pole on your knee, you shouldn't be able to break a lance on your knee, as far as I know.