The strong physiological and psychological reaction to danger is often referred to as:

The fight or flight response is a biological mechanism that enables individuals to react swiftly to perceived threats. When faced with danger, this response triggers a series of physiological changes in the body, such as increased heart rate, heightened alertness, and the release of adrenaline. These changes prepare a person to either confront the threat (fight) or escape from it (flight).

This response is vital in search and rescue operations, where emergencies may require rapid decision-making and action under pressure. Understanding this reaction helps responders manage their own stress and maintain effectiveness in high-stakes situations. It also emphasizes the importance of training and preparation to harness the fight or flight response in a constructive manner rather than allowing panic to take over.

The other options, while related to physiological and psychological reactions, do not specifically capture the dual nature of preparing for active engagement versus avoidance that the fight or flight terminology embodies. Stress reaction generally refers to the body's overall response to stressors but does not focus on the immediate, instinctive behavioral options. Alarm response and reaction mode, though they imply a readiness to respond to danger, are less precise than the well-established fight or flight terminology.