haha no it would not turn into some crazy hollywood gun battle. the guy with the CCP would draw his gun ready to fire, and in this situation, probably would just take a shot right away. you go through some good training to get your concealed carry, and the CCP holder would most likely have a decent idea of what to do in that situation.
even if he did draw and just point it at the guy holding up the school, if the crazy guy tried to take a shot at him, anybody with a half decent reaction time would easily be able to fire before he even got a chance.