Grenades can do up to 30 percent damage. Didn't you see on Prague a couple weeks ago where I killed four people with a single grenade? I know this is rare and difficult, but you said that it was easy. Also, people don't waste nades. I see some players throwing them into random spots, but most of the time I throw it, I hear zombie groans...I just think it's not the best idea to have nades. It's just too unfair for zombies.