I don't need to have done stalls or spins in a 747 to see that the aircraft wing drops left, yaws massively to the right, wing drops to the right and loses height rapidly 'on a knife edge'. Who knows why they applied rudder but I do know that the technique taught is rudder to prevent further wing drop. It's my opinion that people over kill this technique. I won't be using rudder in a stall. I'm not touching it.
Having done stalls in the A320 sim with my company ( following the AF447 accident) I can tell you it requires alot more pitch down than a light aircraft, a very gentle recovery out of the nose down attitude to avoid a subsequent stall (which comes surprisingly easily) and an extension of slats helps alot. These were generally done 10000' and at high altitude.
Having what looks like such a high attitude stall in something with as high a mass as a 747 at this level must have been a nightmare.