Hashbrowns Help

So i’m practicing one of my first chopstick tricks, hashbrowns. I’ve mostly got it down. I just can’t tell what he’s doing from about 1:07 to 1:13. And I can’t find any other tutorials. Thanks for any help in advance.

If you still haven’t gotten it yet, while you have the yoyo mounted on your thumb, flip it all the way over your non throwhand while removing your middle finger, flip it all the way back to the original position, and then flip it back over while moving the string loop toward the inside of the string formation to remove the extra kink in the string.

Hope you get it! This is a really fun trick!