EE WAS OPERATING A ROOF BOLTING MACHINE AT THE FACE AREA. HE HAD DRILLED A BOLT HOLE AND WAS ATTEMPTING TO PUSH A BOLT ASSEMBLY INTO THE HOLE. HE BOLT CAUGHT ON THE SIDE ON THE HOLE AND STOPPE D SUDDENLY. EE FELT PAIN IN BACK. THE WAS NO DAMAGE, IMPROVEMENT OR OTHER FACTORS INVOLVED.