I WAS DRILLING A HOLE TO INSTALL A ROOF BOLT-AFTER DRILLING FIRST SECTION I LOWERED DRILL HEAD TO INSERT EXTENSION, FIRST STILL WAS IN THE ROOF, AS I PUT EXTENSION INTO DRILL HEAD THE FIRST ST ILL FELL FROM ROOF STRIKING MY RIGHT HAND, SMALL FINGER. THE INJURY DID NOT INVOLVE ANY ASPECT OF COMPLIANCE WITH RULES OR REGULATIONS, JOB SKILLS, ATTITUDE OR PROTECTIVE ITEMS. GLOVES WERE W