Not being able to follow someone becomes a slippery slope. Havent you ever been places where the same people show up again and again? This just happened to me and my kid the other day. Went to KFC for buffet then to walmart. I saw several men there who were also at KFC. A paranoid person might have thought 'following me'. A reasonable person knows its best to food shop on a full stomach or people eat first then shop (depending on whether your buying milk or canned goods). And how many times a week do you see news casts where Police are asking for help in solving a crime because they cant be everywhere? You know what a neighborhood watch is right? It is six of one, half dozen of another so we have to base our actions on what works best for us. And for Martin, he screwed up big time by taking a swing at Zimmerman. Flee or fight. You dont confront a predator. I always taught my kid (in relationship to child molesters) to run from strangers, especially if they have a gun. Do you really think Martins parents taught him to confront people in such situations? Typically, parents teach their kids to come to them for help with bullies, gangsters, a$$holes, etc.