In Texas it is legal to shoot someone engaged in criminal mischief after dark.
On your property that is. And the story states that they were in his yard.
“In Texas it is legal to shoot someone engaged in criminal mischief after dark.”
That’s a good law, but this incident took place in the early afternoon, around 2PM. The article below mentions the afternoon.
http://cbs3.com/topstories/self.defense.shooting.2.569713.html