EE TRAMMED A 482 SCOOP INTO THE #10 HEADING WHEN THE SCOOP QUIT. HE GOT OFF, TOOK THE PANEL BOARD OFF & BEGAN TO WORK ON CAPACITORS. HE STATES THERE WAS A FLASH OF LIGHT AND HE GOT A FACIAL BURN. EITHER DURING THAT TIME OR SOMETIME AFTER, AN IGNITION OCCURRED IN THE AREA TRAVELING ACROSS THE LAST OPEN CROSSCUT FROM #10 TO #8 & OUTBY THE OPEN CROSSCUT A DISTANCE OF 2 CROSSCUTS.