Hello, I'm Kamiyo- from Hachioji, Japan.
The trick in the video is my original one, named "Seasick in Hachioji".
It may look easy, but remarkably difficult.
Anyway, please watch it!
Start with a split bottom mount.
Land a yoyo onto the nearest string
(like first part of chain reaction),
and flip it once.
Now your right hand is over your left, then move your hands like crossing each other.
If you get the timing, yoyo will move horizontally.
(The last part of the video is joke.
I went through a ticket wicket, putting a yoyo instead of a ticket.)