The devil couldn't figure out how the Players' minds worked at all. Worse still, it was now at a disadvantage, whereas their eccentric behavior also rendered its silver tongue ineffective.
As such, the creature could only depend on its own brute strength to kill as many Players as it could, so that they would lose the will to fight and ultimately flee.
In theory, any army in this world would lose morale and collapse when they suffer 30% of casualties—even the most valiant of legions would not hold together when they lose half of their forces.
Therefore, the will of a fighting force were all basically in parabolic form—suffering a few casualties early on would embolden them, causing the curve to rise, but once more die or get hurt the curve would drop immediately down to the abyss.