Should a potential crime victim in reasonable fear of of his life be required to attempt to withdraw from a confrontation when possible? Or is it proper to allow him to "stand his ground" and use a firearm to kill the assailant?
Here's some related commentary from UCLA law professor Eugene Volokh:
"Lethal Self-Defense, the Quantum of Proof, the “Duty to Retreat,” and the Aggressor Exception"
http://volokh.com/2012/03/24/lethal-self-defense-the-quantum-of-proof-the-duty-to-retreat-and-the-aggressor-exception/