Nate,
About the coming and going thing, in Texas, we specify from sunset to sunrise, you're not allowed to be on someone's property without expecting The Reckoning. I remember quite a few years ago, there was a guy that lived in a trailer park, and he heard someone messing around underneath it at ~midnight. He went out, saw someone underneath his trailer, and shot and killed the guy. The shooter wasn't charged.
In Lubbock a while back, there was a tractor stealing ring composed of illegal immigrants. Eventually a farmer caught them, and shot and killed to of them, even though they were running. He got off too.
From the Texas penal code:
Deadly Force to Protect Property
"A person is justified in using deadly force against another to protect his property to the degree he reasonably believes the force is immediately necessary to prevent the other's imminent commission of arson, burglary, robbery, theft during the nighttime or criminal mischief during the nighttime, and he reasonably believes that the property cannot be protected by any other means."
"A person is justified in using deadly force against another to prevent the other who is fleeing after committing burglary, robbery, or theft during the nighttime, from escaping with the property and he reasonable believes that the property cannot be recovered by any other means; or, the use of force other than deadly force to protect or recover the property would expose him or another to a substantial risk of death or serious bodily injury. (Nighttime is defined as the period 30 minutes after sunset until 30 minutes before sunrise.)"
Deadly Force in Defense of Person
"A person is justified in using deadly force against another if he would be justified in using force under Section 9.31 of the statute when and to the degree he reasonable believes that deadly force is immediately necessary to protect himself against the other's use or attempted use of unlawful deadly force, if a reasonable person in the same situation would have not retreated. The use of deadly force is also justified to prevent the other's imminent commission of aggravated kidnapping, murder, r4pe or robbery."
The rest is here:
http://www.self-defender.net/law3.htm
Have I already mentioned how much I love Texas?