This is on hard BTW.
Me and my friend keep doing this scenario over and over and keep loosing it. Yes my buddy is a lil obsessed about getting best possible results but even so, we keep hitting the wall of needing to beat 4+ difficulty foes over and over or slamming into the Man in the Pallid Mask's massive intellect test.
My buddy usually brings Delve too deep and yes, it HAS killed him, but even so, is there some rule thats easy to interpret in a negative way for investigators?