technically they are right, save may be only taken against wounds. But they are reading too much into GW rules, which we ALL know is bad for your heal (I swear their sloppy writting and proof reading is almost killer). We are also not the only army that has invul saves for tanks (SoB), and if that was the case, you couldnt take cover saves against shots either (as they are still considered saves) So tell them to stop complaining, and just play the game.