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I would personally feel that it would be justified. For instance, if it is at a urinal, he is a threat, you pull the trigger, he dies. At that point, it's your word against his. It sounds to me like aggravated sexual assault ( the bathroom, urinal, the two alone, no surveillance, etc...). I found this on the texas chl laws.
PC §9.22. NECESSITY. Conduct is justified if:
(1) the actor reasonably believes the conduct is immediately necessary to avoid imminent harm
Below is a direct link:
http://www.txdps.state.tx.us/internetfo ... chl-16.pdf" onclick="window.open(this.href);return false;
I am not an attorney, nor do I practice law.