Picture this. You are loaded with a few shopping bags and just walked into the space between your car and another one. The keys are in your hand but the door isn't open. A man appears at the front of your car and starts approaching you. His hands appear empty and he's asking you "Do you know what time it is?" There's nothing obviously threatening in his dress or manner. What do you do as he's closing distance quickly. Do you close the distance,back away, verbally challenge, deck him with your tuna helper? How about if you add a new component like there are now two possible "threats," one in back as well as the one in front? Keep in mind that you have very limited space to manuver or retreat.