[GAMEPLAY] Bug with Banshee's on Vi when ulting

There seems to be an issue with my banshee's proc when it's used as I'm ulting. This is the third time I've had this happen while playing Vi, but this is the only recording I have of it. I ult'd Annie as she ult'd me. My banshee's should have stopped the stun and allowed me to continue channeling, but instead it left me immobile and unable to do absolutely anything. I literally just sat there floating around as we lost the team fight which ultimately resulted in us losing the game :^)