EMPLOYEE WAS WALKING ON A LOADER CATWALK. EE DUCKED TO GO UNDER A SIDE MIRROR AND STRUCK HEAD ON THE MIRROR BRACKET. A BOLT ON THE BRACKET HIT JUST UNDER THE HARD HAT BRIM. EE'S HEAD SPLIT OPEN FROM THE BLOW, STARTING AT THE FOREHEAD AND ENDING AT THE MIDDLE OF THE TOP OF EE'S HEAD.