In each state that issues Cocealed Carry Permits they have training classes and handbooks that clearly define the rules for self protection or protection of others.
The best way for you to get your answer would be to go on line under the state you are most concerned with and search for their concealed carry permit rules and read them. Even being in the right leaves you open for a law suit under certain conditions. The criminal has the upper hand in todays courts, sad to say.