I honestly dont see how they can solve it themselves at this rate, one thing ive noticed about Needless is that a lot of times (not always) the fights are something like card games. They keep pulling out better cards (attacks, new players etc) and the end is when all the cards are used up with one side stronger than the other. Both sides seem to have used up their secrets and Hatfield right now has the better hand. So either someone pulls out something new like you said before you think might happen with Mio. Or someone new is going to have to intervene.