Nautilus animation bug on Q spell

This morning, I played adc and I was against a Nautilus support. In the begining of the game, he went on the bush and launch is Q (it didn't touch). Then, when he came out of the bush, he was still in Q animation and walked around without moving his body.

How to reproduce it:

Step 1: Ennemy Nautilus go on a bush without vision in. Step 2: Ennemy Nautilus launch his Q without hitting anything. Step 3: Ennemy Nautilus go out of the bush and walk around.

I wasn't recording when it happend and I don't have friend to reproduce it myself so I can't show you there.

By the way I am sorry if I made some error in my english I am still learning. Thank you