EE SUFFERED A DEEP LACERATION TO HIS LEFT LOWER LEG. HE AND CO WORKERS WERE HOISTING A COVER USING A CHAIN FALL AND HE WAS USING HIS HAND TO COUNTERBALANCE THE COVER WHICH WAS HEAVIER ON ONE E ND. THIS CAUSED THE RIGGING TO SHIFT AND THE ""0""RING IN THE HOOK PUSHED THROUGHT THE SAFETY LATCH ON THE CHAINFALL HOOK. THIS RESULTED IN THE COVER DROPPING AND STRIKING HIS LEG. ABOUT 20 SUT