MINERMAN WAS OPERATING THE MINER IN THE #2 ENTRY WHICH WAS ABOUT 118' DEEP CUTTING COAL FOR THE LAST CAR WHEN HE SAW A FLAME GO DOWN THE BACK SIDE OF THE CONTINUOUS MINER. THE FLAME WENT OUT WHEN IT GOT TO THE SCRUBBER. SECTION SHUT DOWN IMMEDIATELY AND MSHA PERSONNEL WERE CALLED AND AN INVESTIGATION WAS CONDUCTED.