So that Sisyphus, this time, let the rock slip from his hands, and then walked, with measurably lighter step, after it down the hill.  The rock, aware that some shift had occured, waited until Sisyphus had approached then addressed him: we'll take turns, would you like that?  Sisyphus said why yes in fact he would, and so the two of them started back up the horribly familiar hill, only this time it was Sisyphus who lead, and the rock, pushing lightly against his back, who followed, and, just as they were about to crest the hill, and arrive at the great flat plain, it was Sisyphus, smiling, who slipped away.