John,
I and my worst englich at werk again.
The video was of a normal quickstop done in an H46, seen on Discovery Channel a few years ago. It amazed me. I read the story of the buttonhook and thought that would be even more so. There is no video of the buttonhook as far as I'm aware.
BTW, the H46 in the video had the brakes off doing the quickstop into a tall grass field....keeping this on topic.