[GAMEPLAY] Sion's ultimate damages turrets

So when playing Sion, when you use your ultimate and manually stop your ultimate directly before you hit a turret it damages the turret for the full damage of his ultimate if theres minions present, but reduced damage if none are present. whereas if you slam into the turret with your ultimate it doesn't do any damage. This works every single time I am able to stop his ultimate in time. I don't know if this was intended but it seems a little over powered when a sion can build 1 damage item and at level 16 chunk a turret for 1000 damage.