Defense from a forcible felony; A person is justified in using threats or force to the degree they reasonably believe it is necessary to stop another person's imminent use of unlawful force. A person is justified in using deadly force which may harm or kill only if he or she reasonably believes that such force is necessary to prevent death or great bodily injury to himself or herself or a third person or to prevent the commission of a forcible felony (unless it is regarding defense of habitation, which has it's own requirements below). You are not justified if you were the aggressor or you are/were/on-the-way-to committing a felony. (The state has pre-empted local cities and counties from further restricting this defense.)
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Am I interrupting this wrong or something?
Yes you are. The REASONABLE part is based in the elements I have already listed. The court does not consider a belief without these elements to be reasonable.