Rarer than any metal, any mineral, so rare that if you scan the entire earth, all six million billion billion kilos or 13,000,000,000,000,000,000,000,000 pounds of our planet, you would find only one ounce of it?
Self-defense is a common defense by a person accused of assault, battery, or homicide. The force used in self-defense may be sufficient for protection from apparent harm (not just an empty verbal threat) or to halt any danger from attack, but cannot be an excuse to continue the attack or use excessive force.
Pointing a gun at someone is considered automatic assault. A charge of battery requires actual contact. Assault refers to any reasonable threat taken against another person. Physical harm is considered assault and battery. Waving a knife at someone is an example of automatic assault. In some cases, it can be argued that assault and battery were committed in self defense.