Azir Ult Bug

Had a game playing as Azir with a Nocturne on the other team. There were 3-4 occasions Nocturne would ult me, never more than one of my teammates around, and i would try and ult him away with Azir's ult. It didnt work both times i tried to do it before he got to me as it just passed right through him. I figured the interaction there might be nocturnes ult just takes him over it. The very next time he ulted me i waited until he was on top of me then ulted. Again ult passed right through.