TexasCHLforum.com

Do not forget there may be many instances where you simply cannot retreat if the attacker rushes you by surprise, for example. There is only a duty to retreat in our hypothetical if you "can" retreat.

Some other possibilities to look at would be Section 8.05 of the Texas Penal Code--DURESS, and

Section 9.22 of the Texas Penal Code--NECESSITY although the necessity defense might not apply due to Subsection 3 of that Section.

And then, there is always jury nullification :) That works best when the deceased bad guy you shot had a long criminal history and was covered in gang tats.