Welp this things happend to me today on live server(EUNE).
So, I was playin Janna and I had Kalista as adc. So, there was a time when we both ultied on same time but somehow Kalista's ulti didn't work untill I've finish my ulti animation .
Think about that audio that Kalista does when she "grab" her binded person but animation happend when my ulti animation was done.
It's this a bug or just a really creepy timing?