So Fiora AP?

Was playing a recent game with fiora and was going ad, as we were destroying enemy team I asked them what I should build next. They said "fuking build AP you bitch", so of course I went AP. AND MY GOD IS SWITCHING FROM AD TO AP LATE GAME STRONG, I dont know how to explain the power but I think some of yall should try this... build AD fiora and if the game goes late enough sell items and go AP, its kinda funny how well it works and its actually pretty damn strong.