Ornn's ult isn't knocking up Yasuo.

I created another thread about a wierd interaction I had playing Ornn vs Yasuo here:

https://boards.na.leagueoflegends.com/en/c/gameplay-balance/E6eLNbhi-so-basically-ornn-cant-even-fight-yasuo-anymore?comment=0006

However, a couple of my initial premises were proven to be misreads of the situation.

However: #1 is valid: I Ulted and hit a Yasuo with the second hit of my Ult, but it didn't stopped Yasuo from acting or actually being knocked up. The game reads out that he's "airborne" and that he turns blue when the Brittle procs, but he never stops skilling or moving, or visually goes airborne. He continues on top 1v3 3 people while a properly functioning knockup would have killed him:

https://www.youtube.com/watch?v=k2k5NsS8Uy0&feature=youtu.be