To get leverage over the locals, he looks for some plot items (seedlings of the god tree) and finds the reincarnators he was looking for at the same time. Turns out one was reincarnated as the twin of the protagonist, stole one of the love interests and then hooked up her twin with a different interest, the yandere abusive one. She never realized he was that bad because she never played his route in the game, asks for Leon's help and he puts the protag in protective custody, away from the man who would beat her and literally lead her around on a leash. Yandere man shows up and gets his ass beat but burns down Marie's residence and all the Rangers, the protag and Marie move into Leon's house. He then falls in love with Marie for telling him off and being a woman that could stand up to him.
Leon then uses the sacred seedlings as stakes for a public duel with the guy that fucked him over. The man knows Leon has no armor so thinks it's some kind of bluff and prepares to crush him with the amazing power of Arrogantz. Leon shows up totally barehanded and everyone laughing at them. The twins worry over him in the stands while the Rangers just mutter among themselves that tree man is so fucked. "Baltfault never picks a fight he can't win."
The wildcard is Luxon, who just pretended to go along with everything when he was taken away. He fires up the overrides and they put on a wrestling type show that makes Leon look like superman. After the guy loses, Luxon, who has been recording the noble's voice for weeks, emulates a falseflag speech about not honoring the duel and takes Partner and blows a supposedly unbeatable Republic airship from the same noble house out of the sky. Leon then uses it as an excuse to heroically retake his own ship.
After seeing this display of merciless trickery and power, reincarnator twin thinks it's a good idea to hedge her bets with Baufault so shows the other reincarnator in her country to the cheat item ship of their game.