[Gameplay]Azir tower in active tower

So my friends and I are playing a game and I am azir. I notice after a little bit that i can use my passive on a active tower. So I tried it and I got double towers all of a sudden. It was like a tower in a tower.With azirs use in competitive play it would be good to get this fixed. And yes both towers would fire so it would be my tower and the other tower attacking the same minon.