Kill that person immediately, regardless of how much damage you will get. Dead is dead. Always assume that they He/She are gong to kill you anyways, since they have shown intent to do so. You have to always regard when Deadly Force is authorized, based on your (where you live) state laws. The state laws are the problem, not protecting youself from violence.
Can everyone just tell Congress and this Administration that we need an equal level of legal self defense on the books?