Ok guys let's try this one. I had some experience with this exact thing. I will post what actually happened after I hear some of your solutions.
It is late at night close to midnight. You drive up to your local 7-11 for some smokes, soda or whatever. You are alone. As you exit your vehicle, you observe 2 men exiting the store with their backs to you, guns in hands, they have obviously just robbed the store. They are 15 feet in front of you and there is one other car in the lot. You notice another male in that car waiting for his friends.
You are, of course, armed with your favorite handgun.
What do you do?