Sir,
What my grandfather once said to me comes to mind 'the only reason to fight fair is if you are fighting naked with you feet nailed to the floor. any other time, cheat to survive.' If in a gunfight, the goal is to survive, and many of the tactics used for such are not approved by the CAS rulemakers. For those that have not been in gunfights, there is no good reason to train as if your opponent will follow a set of rules. Training specifically for CAS events would dictate training to their rules and safety standards, but the safety standards in any gunfight I have the misfortune to be in will be along the lines of 'last man standing is in the right.'
Loki