We know a great deal about how human beings respond to extreme danger. Most people exhibit a range of stress responses as a function of "fight or flight" instincts, which may include some or all of the following: dilation of the pupils, changes in heart rate and the circulatory system, rapid breathing, tunnel vision, time dilation, unreliable or overly acute memories, distorted hearing and loss of fine motor skills.
Some people stricken by fear may literally feel stuck in place, the phenomenon known as "cement feet," where they are rendered helpless and unable to move. Others faced with extreme danger and peril will remain calm, take command of the situation and lead themselves and others to safety.
