based on the video :
The right engine failed. The left was still running. He was trying to turn towards the left. He banked left. But the plane climbed rather than turned. ( perhaps too much aileron input and not ennough rudder input) It got slower and slower. Finally it stalled. Or possibly he just tried something, anything that was different. That does go through your mind. I am getting too far away. I am getting too slow. Its as good as gone so try something, anything else. So he might have reversed to the right instead of simply relaxing the "left turn" inputs.The key here is to just let off a little, don't actually put in "right" inputs. And like you said, hold as much "down" as needed to keep the speed up.Its alot to learn in 3 seconds.