We all know his intentions. He was trying to protect his neighborhood. I'm fine with that, I'm all for that, I love that shit. Protect your neighborhood. But you don't protect your neighborhood by stalking and following someone who is a welcomed guest in it! That's ridiculous for you to even think, let alone say.
I've lived in a city all my life, I am experienced in dealing with crazy people walking down the street with me. I personally stay aware of my surroundings, if I realized that someone was following me I would be cautious and prepare myself for defense, and yes that may very well include having to physically defend myself. That's never happened to me, where I had to physically defend myself, in general a stern voice and simply being a large man takes care of the problem, but I think that mounting a physical defense is reasonable if it were to come down to that.