EE WAS ACTING AS FIREWATCH, PUT HIMSELF BETWEEN EE PERFORMING CUTTING ON STAIR CLIP, AND EE WORKING OVERHEAD IN SCISSOR LIFT. EE IN SECTION LIFT DROPPED 12 LB CROSS BRACE, STRUCK EE ON LOWER B ACK. EE RECIEVED CONTUSIONS AND BRUISE TO LOWER BACK. NO TIME LOST, EE RETURNED TO WORK 11-18-00.