EE WAS DOING REPAIRS ON DRAG CHAIN. DRAG CHAIN HAS A GUIDE IDLER & IDLER WAS OUT OF ADJUSTMENT IDLER IS MOUNTED ON A BRACKET MADE OUT OF ANGLE IRON. USING A CABLE HOIST/PULLER TO SECURE IDLER DLER, EE CUT BRACKET WITH TORCH. IDLER & BRACKETWAS HANGING ABOVE EE'S HEAD & WHEN BRACKET WAS CUT THE CABLE HOIST FAILED TO HOLD IDLER & IDLER & BRACKET ROTATED DOWN, STRIKING EE IN THE MOUTH