Stress theory is investigated since cohesion mitigates stress.  As an individual is exposed to a combat incident the way that stress is coped with will determine if they will stay around or try to run away from the threat.  A yerk-dobson inverted-U function determines how the performance of an individual will decrease as stress increases, thus making the perception that the situation is becoming unmanageable.  This inverted-U function in related to the heart rate, which is a good thermostat on perceived stress. These relation ships can be seen in the figure below: