the guy 's head snapped back in a mist of blood and bounced forward again off his massive deltoids and reacher tried for his other eye socket with his left elbow , a ferocious in-and-out snap from the waist , and then he put a forearm smash from the right into the guy 's throat , a real home run swing , and then he kneed him in the groin , and danced behind him and kicked him hard in the back of the knees , a sweeping , scything action , so that the guy 's legs folded up under him and he went down heavily on his back on the path .