EE WAS HELPING INSTALL A SCREEN PLATE AT THE ROTARY BREAKER BLDG. A COMEALONG WAS ATTACHED TO THE SCREEN SO IT COULD BE LIFTED. WHILE LIFTING THE SCREEN INTO THE BREAKER 1 SIDE GOT HUNG UP 2 EE'S PUSHED THE SCREEN TO HELP REALIGN IT AT WHICH TIME SCREEN CAME LOOSE FROM COMEALONG STRIKING ARM OF EE AS HIT THE GROUND.