I have watched that clip 100x and I’m completely mesmerized. The execution of the move is perfect. I’d even argue that this flip is more impressive than Arya’s dagger switch on the Night King. That was more of a drop than a flip. This maneuver against Brienne had her dagger flipping like a football on the opening kickoff.
Team Arya for life. Say what you want about the episode, and you can read my thoughts here, Arya will always be the badass on Game of Thrones. That will never change.