EMPLOYEES WERE CHANGING ROTOR ON 130/150 UNIVERSAL CRUSHER AND WHEN THEY LIFTED UP THE ROTOR OUT OF CRUSHER EE WAS GOING TO ATTEMPT TO STABILIZEIT AND IT SWUNG BACK INTO HIM AND PUSHED HIM UP AGAINST THE DOOR AND MADE HIM HIT THE BACK OF HIS CALF MUSCLE ON THE INSPECTION DOOR. IT MADE A BRUISE ON HIS CALF AND I TOLD HIM WE SHOULD GET AN X-RAY.