Equestria had two humans arrive in Equestria at separate intervals. They both were cruel, had magical abilities, caused great destruction, and they both were defeated by the Element Bearers. Even then, they barely succeeded. They all knew it was a matter of time before another appeared. So, Twilight tried to summon a protector. To their horror, they got another human. Despite their best efforts, the human escaped, on the run.
When the banishment didn't work, Applebloom realized that this human may be different...