Self-Defense — Defense of Third Person is an act of protecting oneself or another person from harm. It is a legal defense based on the right to defend oneself or another person when threatened with violence. This defense is typically invoked when the threatened person reasonably believes that they are in imminent danger of harm, and that the use of force is necessary to prevent the harm. There are two types of Self-Defense — Defense of Third Person: 1. Perfect Self-Defense — Defense of Third Person: This occurs when the threatened person uses only the degree of force necessary to prevent the threatened harm and no more. 2. Imperfect Self-Defense — Defense of Third Person: This occurs when the threatened person uses more force than necessary to prevent the threatened harm. In this case, the defense of self or third party is accepted, but the threatened person may be subject to criminal charges.