How could he end up on his back at 12,000 ft? He had to be doing over 250 knots. I know the MD10 has one engine above the wing and two below. Even in the 727 adding full power without a pitch up can only be accomplished by trimming down and fwd yoke. Once power is applied speed increases and the nose will pitch up. How could you end up 12 degrees nose up in a standard stall recovery?