Utterly Mad

They are great! I had them set to "push" when the first incident occurred. After that, I set them to "guide" and no more accidents. Then a forgotten beast got into the fort through the minecart access and I noticed the cart was almost full. I casually changed it's setting to "push" and the result was an utterly wrecked web casting diorite quadruped. Smashed that fucker to pieces with the cart alone, and the flying lead ore finished the job of powdering what was left of it's face.