Ah, I see the problem. The missing instruction is when the yaw stops check the rudder and move the stick forward, (not holding full opposite rudder to reverse the yaw). If the yaw is stopped when the stick goes forward the stall is broken on both wings and with no couple a dive results. Since the plane may be banked a spiral dive may result but that should be easy to fix... The interesting thing is that provided the COG is in limits, the NASA tests showed the reliability of this method.
Cheers