It's a really good idea to look for things in the environment to use against the rotters. There's the obvious things, like electric fences or exploding cars, but if you think creatively--and I do--you'll notice other, shall we say, "opportunities." Pools of water with cables in them, for example. If you switch on the closest lamppost, that'll fry any rotters that splash through it. Ooh! Or spikes! If you find some spikes, try to throw or kick the rotters at them. Talk about satisfying!