ZULA’S RISING TO a crouch and sudden scramble toward the base of the rock elicited several bursts of gunfire from down below, each of which was answered by a crisp rifle shot from the top of the rock above. The shooters below, who she imagined were firing from a standing position after sprinting up the last few switchbacks, did not really have time to situate themselves and draw a proper bead on her; she thought she might have heard a few of the insane-bumblebee noises that apparently signaled the near approach of high-velocity rounds. But the going here was much easier than below, partly because of the gentler slope and partly because the footing was better—more hard rock and less random boulder pile. She forced herself to cover at least a hundred feet before risking a look back. The tree line was no longer visible. She experimented with rising out of her crouch and saw it slowly peek back over the horizon, then dropped her head before anyone could draw a bead and pull a trigger. She ran now in a hunched-over posture, headed for that frantically waving T-shirt, and covered another couple of hundred yards before looking back again. She was now able to stand all the way upright without exposing herself. Winded and banged up, the cold dry air sending an ice pick into the root of her shattered tooth with each breath, she permitted herself to quick-walk the last bit, and finally came within conversational distance of the T-shirt waver.