Hilda hops to Marianne and calls in these bandit students to do them. On 31~36 loading screens he activates some kind of crest to feminize random people she comes across. On 114~119 loading screens, Seiros gives a vision of stuff about to come. The chapter ends Marianne cosplaying similar to (F)Byleth.
Whoever made this most likely didn't quite play the game themselves, but most likely saw some gameplays. Not that I say this "Parody" is bad.