EE WAS BEING TRAINED AS A ROOF BOLTER HELPER. THEY WERE TRAMMING THE MACHINE BACKWARDS LAYING THE TRAILING CABLE OVER THE MACHINE AS THEY WENT. THE OPERATOR BEGAN TURNING THE BOLTER AROUND THE CORNER. HE HIT AN IRREGULARITY IN THE BOTTOM WHICH CAUSED THE ATRS TO SWING SLIGHTLY. THE PAD OF THE ATRS STRUCK THE INJURED EE ON THE LOWER LEFT LEG.