If you carry a gun for self-defense it is important that you spend time learning about real-life scenarios so you can visualize how you will react if you get into a similar situation.
Even a quick trip to pick up a pizza can turn into a deadly encounter, as a man recently discovered in Levittown, PA.
In my analysis of the situation, he handled the situation perfectly:
Also notice that the police are not pressing charges against the customer for defending himself. This is a great victory for law abiding citizens. Guns save lives!