You are not a real Legend if this never happened to you

The jayce one is actually a thing. The player just waited a bit to long to use the acceleration gate

I have cancelled many AA because Miss Fortune has a bit of a bug on hers. And Last Hitting gets even worse when your AA is cancelled because the minion died at that point in your auto attack where it couldn't cancel, so the rest of your minions rinse and repeat for all of the other enemy minions.