TWO EMPLOYEES HAD COMPLETED BOLTING THE #1 ENTRY WITH A FLETCHR ROOF RANGER II BOLTER. ONE WALKED BACK TO THE OFFSIDE FRONT TIRE TO CHANGE A DRILL BIT. AFTER LOWERING THE ATRS, HIS CO-WORKER T RAMMED THE MACHINE BACK ONE TO TWO FEET AND TRAMMED THE MACHINE OVER THE OTHER'S FOOT.