Under the rules of engagement, the four elements that must be considered before using force in self-defense are de-escalation, necessity, proportionality and ______.

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The four-part decision framework for using force in self-defense centers on de-escalation, necessity, proportionality, and pursuit. De-escalation aims to reduce danger without violence. Necessity requires that force be needed to avert an imminent threat. Proportionality ensures the force used matches the level of the threat. Pursuit then addresses what you do after the threat is addressed: whether to pursue the aggressor to prevent further danger, or to disengage in a way that keeps you safe and within lawful bounds. Deterrence, escalation, and containment are related concepts but don’t fit as the required fourth element in this framework. Pursuit is the best fit because it explicitly covers the post-threat action and ensures continued safety and legality.