“Understanding the limbic system and its core freeze, flight, or fight responses is the first phase in detecting a threat. It’s important to remember that the enemy stalking a Marine on patrol or a seemingly helpless woman on her way home is under duress. This stress manifests itself in physical actions. If we look for these particular physical actions when our limbic system gives us the “heads up, something’s not right” signal, we’ll be able to operate effectively “left of bang.”