I might have found a Quinn bug...

So today I was having a 1v1 with my friend, Raptor inc, on Howling Abyss as Quinn with no skin. I only had a Blade of the Ruin King, Zeal and a Dagger. So anyway, I was winning so I was up at his Nexus killing the minions for the extra gold when my passive hit a minion, so i went to last hit it but just before I was able to last hit it my super minion killed it before my shot even hit it. Quinn then began to auto attack the nexus but every shot she took was a her passive hit. It seemed that it had glitched Quinn to shoot 3 arrows permanently as she hit the nexus. I don't know if this is supposed to happen but all I know is that he was mad and it felt kind of cheap. Thought Riot might want to know just in case. Bye Bye.