 What is Rolf's new plan when he spots the rocket?
Sisko Rolf's stocky body was a blur of motion as he cut the rocket jets, doused the twin searchlights, and switched over to the audio beams that served so well on the surface when blind flying was in order. Somehow Rolf found the strength to wrap his fingers around the control levers and snap on a quick burst from the landing rockets. Toward this barrier the spinner bore him, and Rolf was content to let it move in that direction—from the heights of the wall he could scout out the country beyond. Deftly Rolf nested the spinners again in their pack before he set out toward the heaped-up mass of stone blocks that was the wall.
 He'll be able to distribute water to Mar's colonies, and get out with Tanner and the girl.
 Now that he knows the location of the water, he'll be able to return to grab it for himself.  He'll have a way out of the caverns at last, be able to escape.  He can escape the fighting and leave Tanner and the girl behind.  He'll be able to distribute water to Mar's colonies, and get out with Tanner and the girl.