Why did Prof Loh do an “arm gesture”?

[RZ923]

This might not be related to maths.
I understand the concepts about combinatorics Prof Loh talked about, but...
Why did Prof Loh do this gesture at the end of the video?

[debbie]

@RZ923 Thanks for noticing! Yes, this is an error in the video, not to do with any math, voodoo, secret Jedi sign language or petitioning to a higher force. It's on our list of things to do. Thanks for your patience while we slowly improve the course!

[Kaden Xia]

@debbie can you please respond to my email please?
Thanks!!