In Oklahoma a person who enters the home is presumed BY THE LAW to represent an immediate threat of death or grievous bodily harm. Castle Doctrine and Stand Your Ground. http://www.oklahoma-criminal-defense.com/media/oklahomas-castle-doctrine-and-stand-your-ground-laws Someone walks on your property, not inside the home. They could be asking directions, but you feel uncomfortable. At this point, shooting them is probably not justifiable. You tell them to stop. They don't. You draw and tell them to stop. They don't. Bang. Totally justifiable.