THE EE WAS ATTEMPTING TO BREAK A DRILL STEEL FROM THE ROTARY HEAD. THE JAWS ONT HE DECK WRENCH WERE EIGTHER WORN OR SPRUNG AND COULD NOT GRIP THE FLATS ON THE DRILL STEEL. THE EE INSERTED A CH IPPING HAMMER BETWEEN THE DRILL STEEL AND A JAW OF THE WRENCH TO IMPROVE PURCHASE. THEN THE ROTARY HEAD WAS TURNED ON. THE CHIPPING HAMMER WAS EJECTED AND STRUCK THE EE IN THE RIGHT FOREARM.