I read your link. Well, he hasn't shot anybody just yet -- the sign is just "talk". He's also careful to cover himself that he feels personally threatened, and for his family -- so he's careful to preserve a self-defense theory in his 'pre-imagining" of what might happen.
Find me another Texas example, one where the rubber really meets the road on this issue
Again, since it's apparent you are ignorant of Texas Law, I strongly suggest you contact a Texas Lawyer because you have no idea what you're discussing.