In potentially dangerous situations, reacting fast can literally spell the difference between life and death. For example, in situations involving an impending dangerous accident, not reacting will result in harm. Quickly recognizing a threat and reacting appropriately before the threat approaches in a lot of cases will mitigate the damage down.
One of the biggest threats to a person’s lives can be other humans. It is essential to be aware when in environments that trouble can occur. This means being skeptical of people that seem “off” and be prepared to react accordingly. Not allowing those with bad intentions to do what they want can prevent bad things from happening.