How accurate is this? There's a video embedded in the article. https://www.youtube.com/watch?v=CinAYBZYANg https://www.youtube.com/watch?v=CinAYBZYANg To me i

How accurate is this? There's a video embedded in the article. https://www.youtube.com/watch?v=CinAYBZYANg https://www.youtube.com/watch?v=CinAYBZYANg To me it looks very shaky, e. g. at 0:20-0:25. It seems like they're not using an underlying physical model that takes momentum into account. Also it looks like the system is interpreting the movement of the ponytail as head movement.