This is Texas. No retreat here. If you're in my house uninvited, everything else is assumed, and I can kill you dead in your tracks.
... and because 'This is Texas', if I don't follow the Texas castle doctrine laws, my butt will be sitting in a Texas slammer for murder.
There finished it for ya.
Let an unarmed,confused, drunk stagger through your unlocked front door and you drill him and see what happens.