RE: what is your neighbor is being threatened
The Texas case is completely different than the hypothetical at the beginning of this thread. First of all noone claims that he was protecting another person. Second, even in castle doctrine states you're probably not allowed to use deadly force when someone is running out of your yard, most of the time it's usually when they are in your residence not anywhere on your property. And also, if someone is running away, you probably can't shoot them when they try to disengage the encounter.