TexasCHLforum.com

I don't know how "Castle Doctrine" got stuck to this bill, because Texas already had a castle doctrine: that is, no duty to retreat within your own home before resorting to deadly force.

What people frequently call "castle doctrine" is the law that removes any obligation to retreat, so long as you're in a place where you have a right to be. It's more accurately called a "stand your ground" law.