EE WAS DRILLING BOLT HOLE & WAS HAVING TROUBLE. HE DECIDED TO CHANGE THE BIT. AS HE BEGAN TO DROP DRILL HEAD THE STEEL BECAME STUCK. 2 UPPER STEELS STAYED IN THE MINE ROOF & THE BOTTOM WAS OUT OF THE ROOF. USING THE BOLT WRENCH TO HIT THE DRILL STEEL HE HIT THE ROATION LEVER. STEEL SEPARATED, SPUN AROUND & STRUCK EE IN THE FOREARM.