Tirek has won his fight against Twilight and decides to ensure his victory in full instead of storming off to destroy Equestria. Too bad there is someone that can stop him.
Now Spike is forced to act to protect his friends thanks to someone doing something that wasn't in the plans of Celestia. Rather impressive considering no one else had tried to do the same before.
*If you are feeling generous you can buy me a Ko-Fi!!