"We need to wait until all the facts about Trevyon Martin's death come out."

[X_Digger]

18. Regarding your last two questions, the answer is generally 'no'.

http://www.txdps.state.tx.us/InternetForms/Forms/CHL-16.pdf
[div class='excerpt']
PC §9.22. NECESSITY. Conduct is justified if:
(1) the actor reasonably believes the conduct is immediately necessary to avoid imminent harm;
...
PC §9.32. DEADLY FORCE IN DEFENSE OF PERSON. (a) A person is justified in using deadly force against another:
(1) if the actor would be justified in using force against the other under Section 9.31; and
(2) when and to the degree the actor reasonably believes the deadly force is immediately necessary:
(A) to protect the actor against the other's use or attempted use of unlawful deadly force; or
...
(2) did not provoke the person against whom the force was used; and


The 'generally' part is that if, for instance, you and a guy stepped outside a bar to 'engage in fisticuffs', and he pulled a gun- you would be justified in using deadly force in response.