[GAMEPLAY] Yasuo bug — game-breaking

Bug is as follows: Yasuo's ult has never been intended to make him invulnerable to crowd control—in fact, that was one of the counter-play points of Yasuo; however his ult is currently mitigating crowd control that should otherwise completely remove him from it. The most recent example is what I shall base the "how to reproduce" section.

Champion: Tristana Enemy champion(s): Yasuo (and anyone with a knockup) Levels: 6+

1. Have Tristana standing directly next to Yasuo, even on top of (as if she W'd in).
2. Knock the Tristana airborne.
3. As she is knock airborn, have Yasuo activate Last Breath on her whilst simultaneously using Tristana's Buster Shot on Yasuo.

Now, at this point, Yasuo should be knocked out of his ult, yet this bug allows him to COMPLETELY MITIGATE the displacement of Buster Shot. This loses games.