I hope this is an appropriate forum for this question. I'm writing a science fiction story set on the moon. In the story, my heroes, inside a rover type vehicle are blasted into a ballistic arc by a comet impact. The rover has limited "jump" rockets but they and the fuel supply are inadequate to land the vehicle back down on the lunar surface, or kick it into lunar orbit. The rover does carry a smaller two-person rocket powered "flyer" but it also lacks sufficent power/fuel to safely land given their altitude and speed. Question: is it possible for my heroes to grapple onto a large rotating hunk of lunar rock, also blasted into the ballistic arc, and close to them, and with a line and winch, using the the rock's angular momentum "slingshot" the flyer with enough transferred vectored momentum to slow the flyer enough to land safely? I would appreciate any help with this problem.