[muawiyah]

The law does not require either to retreat. The law allows either one to use force to protect his or her own life. The law even allows lethal force if your life is actually in danger.

Martin would have been right to physically attack Zimmerman since it was Zimmerman admittedly following Martin and not the other way around.

[Ratman83]

So you are saying that any who follows someone else has become a physical threat just because they are following someone. Is this what you mean? The mere act if following someone and observing them is grounds for a physical attack.