THE POWER HAD BEEN OFF. ONCE THE AC POWER WAS RESTORED, EE WAS TRYING TO BEND ROOF BOLT AGAINST ROOF, AS RESIN HAD ALREADY SET UP. HE WAS USING HIS WRENCH TO BEND BOLT BY INCREASING PRESSURE ON HIS DRILL HEAD. AS PRESSURE ON DRILL HEAD INCREASED, WRENCH SLIPPED OUT OF HAND AND STRUCK EE ON THE FACE.