Morgana Binding Dissapeared [GAMEPLAY]

I was playing a ranked game in League of Legends and I was playing Morgana and I sent out a binding and it disappeared in the middle of going towards its target. Watch the video and you will see what I am talking about. My binding literally disappears... REMAKE

I tried recreating this bug with a friend but I cannot find the cause of what happened. Initially we thought maybe Swain's bird (Beatrice) was the cause of it but was unable to reproduce anything with that. So we only got this to occur once...