Aphelios' Qs interaction with ammo system

I found out that Aphelios is able to cast Qs while he's at less than 10 ammo and the spell requires exactly 10 to be cast. I see that ammo is like mana, so a champion is unable to cast a spell that costs more mana than he has in his pool, then ammo must behave the same. I am not sure whether it is a bug. If it's not the case, it will be accurate to make ammo behave like mana in order to help balancing this champion who seems OP, expecially with the interaction that gravitum's Q and infernum AA have with runnan's.
Report as:
Offensive Spam Harassment Incorrect Board