In North Carolina a person may use deadly force when defending themselves or others from the threat of immediate death or serious injury. This applies when the person in in their home, vehicle, or place of work. The person using the defensive force must stop when the aggressor has stopped the illegal action, or has retreated from the premises. There is no duty to retreat from where the person has the right to be. In this case deadly force maybe used to prevent immediate death.
Castle Laws are laws that address the use of force when defending one's self inside their home, or on their property. Some states expand this to vehicles, and the person's place of work. Castle Laws generally include: the places where this law applies, the requirements fro use of deadly force, if there is a duty to retreat, the amount of force that maybe used in defending one's self or others. These vary widely from state to state.