lol, im not a F.E guy but i do find their videos entertaining there is even a video showing a reflections on an ipad that is claimed to be a cameraman
in a mask
As others have said, the jerky movements seen in the reflection are due to the fact that this video has been sped up. Undocking from the ISS happens
more slowly than that video indicates.
If you speed up human motion 3 or 4 times normal speed, it would look this jerky.