Hi guys. Last Sunday, I played against my friend who play Skavens. In his army, he has one flamethrower and an unit of Stormfiends with one that use a flamethrower too. These flamethrower are pretty annoying because when they are in range, they deal 1D3 or 2D3 of mortal wounds, without having to roll dice. My problem is that if I don't kill these guys really fast, it's a real pain in my ass. So, my question is, what kind of defences, tactics against that kind of foe ?