EE AND A CO-WORKER WERE OPERATING A FLETCHER RRII ROOF BOLTER IN THE #5 ENTRY, NEAR SPAD #12971.EE WAS OPERATING THE HELPER SIDE WITH THE DRILL BOOM POSITIONED NEAR THE RIB. A COAL RIB LOFT 4' L AND HIGH X 0-8""THICK FELL, STRIKING EE ON THE BACK AND LEG, PUSHING HIM INTO THE ROOF BOLTER.