Knowing how to react to sudden threats could help you in which situation?

Understanding how to react to sudden threats is crucial in situations that involve direct risk to personal safety or the safety of others. In the context of surviving an attack, this knowledge allows an individual to assess threats quickly and respond effectively, whether that involves evasion, self-defense, or calling for help. Being trained to recognize and respond to threats can significantly increase one's chances of successfully navigating dangerous encounters.

While defending a friend or saving someone from drowning can involve quick decision-making, they are often not as directly linked to the concept of personal threat survival as in the case of experiencing an attack. Winning a debate, on the other hand, is more about rhetorical skills and preparation rather than responding to threats, making it less relevant in the context of this question.