Many states have not codified self defense in quite those words. They may be mentioned in the rules of the court, as a definition of affirmative defenses, or the state may rely on the common law principle that a person may justify what would otherwise be the offense or tort of some form of assault by asserting that they defended themselves. (I think this is why I didn't bother to try to dig up VA law on this; I know there's not much spelled out.)For some reason I can not find anything for Minnesota...