[Gameplay] Kalista Using Ult When Bound Champion is AFK Caused The Champion To Be Invulnerable

At the end of a game, Kalista's support (Brand) was afk and she tried to ult and pull him out of the fountain for my team to kill. Once the animation ended, Brand was invulnerable as the AI walked him back into the fountain. Not exactly sure how to reproduce other than recreating the same situation we were in. First time this has happened to me.