read my previous post, i felt like an idiot when i realized how simple it felt tho to some it may not seem all that simple but it actually is
and remember what one of ur 2 allies said upon entering that first room in that 4way split: "check everything, including the sideways shelves
its also not worth going too far beyond that moment anyways save for 1 battle due to a scenario loop bug that seems to occur after a battle later on