DRILLER & HELPER WERE IN THE PROCESS OF REMOVING BROKEN DRILL STEEL FROM CAROUSEL. BAD STEEL WAS ATTACHED TO WINCH LINE PICKING IT UP TO LAY ON GROUND. HELPER WAS PUSHING STEEL AWAY FROM RIG WITH ONE HAND WHILE THE OTHER WAS ON THE RAILING FOR SUPPORT. DRILL STEEL SLIPPED FROM HELPERS GRIP AND SWUNG BACK AND SMASHED THE OTHER HAND AGAINST THE RAIL.