When you knock down a commander they can randomly recover all of their HP, making the entire time you've been whaling on them a waste of time. The good thing, however, is that it can only get better from here.
Super interesting takes on the routes of Three Houses that don't end up going anywhere cause they don't want to imply that the lack of Byleth makes everything better. (It does)
Normal is too easy, hard is bullshrimp, and the level design is hot ass. You also need to complete this DLC entirely for every single save file. Basically just full of good decisions.