EMPLOYEE REPORTED: HE AND A COWORKER WERE OPERATING SHIELD HAULERS TRANSPORTING THE ""MUTT"" FROM THE 6TH SOUTH TO THE LONG WALL RECOVERY CHUTES. BOTH OPERATORS HAD DUCK BILLS UNDER THE MUTT CAR RYING THE MACHINE ALONG MINE TRAVELWAY. THE COWORKER TRAMMED FORWARD PULLING THE MUTT FROM THE VICTIM'S DUCK BILL, THIS CAUSED HIS MACHINE TO BOUNCE RESULTING IN HIS HEAD STRIKING THE CANOPY.