THE EMPLOYEE AND A CO-WORKER WERE INSTALLING A VENT LINE. THEY WERE ATTEMPTING TO CONNECT AN ELBOW TO THE HARDLINE AND HAD THE BAND IN PLACE. THE EMPLOYEE STEPPED BACK TO GET THE DRILL TO TIGH TEN THE BOLT ON THE BAND AND HIS FOOT SLIPPED OFF THE SCISSOR DECK AND HE FELL HEAD FIRST TO THEGROUND.