Answering fire now came from above: single shots, fired deliberately. These seemed to discourage the shooters below. Zula rolled on her back, rested her head on that flat rock, tried to figure out where it was coming from. The obvious answer was a large mass of solid stone, about the size of a city block, that jutted out from the ramp of talus. She inferred that it had a flattish top and that someone was up on top of it with a long gun.