Whilst disconnecting the elevator from the elevator bail to lower it to the work floor using the Cat line, the driller hooked the Cat line onto the elevator and together with a floorman began to remove the retaining bolts from the link lock. As the floorman pulled the elevator bail towards him from the side (to unlatch the elevator from elevator bail), the elevator dropped due to a lack of tension on the Cat line landing on the floorman left foot.