This field has been created to regulate the adrenaline release in your body to its optimal levels for best performance in cases such as stressful tasks or situations, before an exam or interview, during a conversation with your boss or a civil servant, during a dispute with an opponent, and so on.
If the adrenaline is too high already, the field will activate a second option-it will send a message to your brain that this adrenaline rush is associated with a pleasant experience (much like what you experience during practicing a sport or another demanding but pleasurable activity), and not a threat.