JKSManga
I think quin is going to have to come clean about his use, just be like "look, you saw our power, would we really need to use weird tactics if we wanted to kill anyone here? we could a killed everyone down there and pretended it was an unfortunate accident, but we have no desire for anything like that. in fact, was anyone seriously injured or killed by my ally? I can explain why he took the beast if given the chance" and then explain they have someone who can put humans minds who are mortally injured into beasts, by putting them into these strong beasts they can have demon tiers fighting on their side against the dalki, what stronger ally could you ask for than a demon tier beast? other than the blade family no one has been shown capable of soloing demon tiers
Well at least everyone who went underground is back safe and sound before thing start to go wrong, but it's doesn't surprise me one bit at this point, as every time some good happens to the Cursed Family something has to go wrong immediately after just to make their live that much more entertaining.