EE WAS ROOF BOLTING IN AN AREA WHERE THEY HAD CUT THE TOP OUT FOR INSTALLATION OF A BATTERY CHARGING AREA. HE SAW THE PIECE OF ROCK & HAD INSTALLED A BOLT BESIDE IT TO SUPPORT IT. HE THEN DR ILLED HIS NEXT HOLE & BENT OVER TO PICK UP A ROOF BOLT FROM THE GROUND WHEN THAT PIECE OF ROCK FELL OUT STRIKING HIM ON HIS LOWER BACK & SIDE.