Panic on board ANA flight

Panic on board ANA flight, it seems that, after the commander of the flight left the cockpit, the copilot took the airplane into an unusual attitude. Because of this, the airliner which was steady at cruising altitude loose thousands of feets. At the end the captain of the flight succeded to regain control of the aircraft moreless at 3500 from the ground.
In this video the formal excuses of the ANA management and a computer simulation of the event.