Element 1 - Actual belief regarding use of physical force by other person
The first element is that when the defendant used defensive force against
If you have found that the force used by the defendant was deadly physical force, then you must find that the defendant actually believed that <insert name of other person> was not only using or about to use physical force upon (him/her/<insert name of third person>), but that the other person was either using or about to use deadly physical force against (him/her/<insert name of third person>), or inflicting or about to inflict great bodily harm upon (him/her/<insert name of third person>). "Great bodily harm" is not limited by the definition of serious physical injury and may encompass other acts such as sexual assault or the threat of sexual assault.4 The term "great" has its ordinary meaning and indicates a bodily harm that is substantially more than minor or inconsequential harm.
The act of <insert name of other person> leading to the defendant's use of defensive physical force need not be an actual threat or assault. The test is not what the other person actually intended, but what the other person's act caused the defendant to believe was the intention of the other. In other words, the danger to which the defendant was reacting need not have been actual or real. In judging the danger to (himself/herself/<insert name of third person>) the defendant is not required to act with infallible judgment. A person acting in (self-defense / the defense of others) is sometimes required to act instantly and without time to deliberate and investigate. Under such circumstances it is possible to perceive an actual threat when none in fact existed.
Element 2 - Reasonableness of that belief
The second element is that the defendant's actual belief about the force being used or about to be used against (him/her/
Element 3 - Actual belief regarding degree of force necessary
The third element is that when the defendant used physical force upon
Element 4 - Reasonableness of that belief
The fourth element is that the defendant's actual belief about the degree of force necessary to defend (himself/herself)/
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The objective of fighting for self-defense is to cause as much damage in as few moves as possible. This is because a self-defense fight, or "street fight" is usually very short. Many street fights do not last longer than 10 seconds. For this reason, there are a few basic laws to fighting that you should obey at all times.
To Prevent a Fight in the first place
If you have to participate in a fight
I realize this answer is only good for hand-to-hand combat. Covering self-defense for firearms and knives would take up too much space.