Yasuo Ult Bug
This bug has been affecting Yasuo for ages and really can make his ult useless.
The Bug
The bug is that if your cursor is not over the enemy the game will not let you ult, so what this means is that if you try to quickly ult of a quick knock up (think Rammus Q into enemy) then you can't ult unless your cursor is exactly over them.
The Ability
The ability is said to do:
ACTIVE: Yasuo blinks to the nearest visible Airborne icon airborne enemy champion to the cursor, instantly generating maximum Flow.
To point it out it says "Nearest" which is a relevant term, so if there is only one champion in the air then no matter where you cursor is he is "the nearest" but the game seems to take a masisve, and I mean masisve amount of time to find the target closest to the cursor, this causes tons of issues cause not only do you have to instantly react to team mates getting knock-up (with certain abilities) plus then ping, but you also have to have your cursor on top of them, so if a Rammus gets a knock-up (from his Q) then you need to deal with the 0.75 knock-up, then the ping, then this cursor bug.
Recreating It
Try going into a custom game and throw you 3rd Q a the enemy then move your cursor across the screen (far away from the enemy), then when you 3rd Q hits them and there knocked-up spam the R key and no matter how much you spam the R key you will never ult them, just due to the fact your cursor is not near them.
Meaning that a champion that already requires another action to use his ult also can now not even use it when those requirements are met.
What Should Be Done?
Make it so that Yasuo ult will go to the nearest target to the cursor, unless there is only 1 champion knock-up in which case ult that champion no matter where the cursor is, this means that if only one target is knocked up and you press R you will go to the 1 target, but if multiple people are knocked up, the ult will go to the target closest to the cursor.