CUTTING THE SUB CONNECTOR OFF OF A PIECE OF DRILL STEM WITH OXY/ACETALINE TORCH. SUB CONNECTOR HAD MALE THREAD AT EACH END & DRILL STEM HAS AN INNER JACKET FOR DRILL OIL. APPEARS THAT SOME OF THE OIL HAD RESERVOIRED IN UPPER END OF THE MALE THREADS. AS EE CUT, THE TORCH HEATED & PRESURIZED THE DRILL OIL, CAUSING IT TO FLASH/EXPLODE. 1ST & 2ND DEGREE BURNS TO FACE & NECK.