(Takes place prior to the timeskip in "The Last Problem".)

Despite Equestria appearing to enter a new era of profound peace, Starlight Glimmer decides that the students at her school should be taught how to defend themselves. To that end, she establishes a self-defense class.

Deciding it easier to teach by demonstration, Starlight tries to find a volunteer to spar with her. But nopony within the school is willing to go hoof to hoof with her, not even her closest friends.

Fortunately, a savior comes in the most unexpected and unlikely of places. Tempest Shadow, no stranger to combat herself, shows up and offers to oppose Starlight for the sake of the demonstration. Who will prevail in this clash between powerful unicorns?