I was out of rail gun ammo. I had one buster left, but the buster wasn’t going to be much good if it had to chase the Brazilian around the asteroid. I examined the return from my last ping and spotted what I’d been hoping for—the steel ball from one of the defunct busters. I sent out a couple of roamers, collected it, and loaded it into the rail gun. The steel balls had been deliberately sized so that they could double as rail-gun ammo.