EE & CO-WORKERS WERE REMOVING A BENT DRILL STEEL ON THE #4292 DRILL. AFTER PLACING DRILL MAST IN DOWN POSITION THE BOOM TRUCK WAS BEING USED TO REMOVE BENT SECTION. WHILE THE STEEL WAS BEING R EMOVED, IT GOT FOULED MOMENTARILY & WHEN IT SPRANG LOOSE IT SUDDENLY CAME IN HIS DIRECTION. WHEN MOVING TO GET OUT OF WAY HE WALKED INTO ANOTHER PIECE OF DRILL STEEL (EYE LEVEL) ON THE RACK.