[GAMEPLAY] Vi ult is slowed, doesn't knock up and doesn't finish the animation to know up.

During a teamfight, the enemy Vi ulted me as Caitlyn and the ult was slowed down, didn't knock me up or show the finishing animation to knock up. I don't really know how the glitch happened or how to recreate it but after look at the video a few times my guess would be that the Nautilus auto attacked to snare right when the Vi ulted causing some weird interaction but I don't know for sure if that is what caused it.

The game happened on 03/26/2017.