I once again call your attention to the applicable laws here. You can only claim self defense if you're in eminent danger of serious bodily harm. Just because someone is following you does not give you the right to attack them.
Au contraire. I'm a small woman. Say I'm out walking late at night...had to go check on a neighbor or something...reason doesn't really matter why. This is America and I can walk around at night if I want to.
Someone starts following me. That's going to scare me. Maybe I even tell them to get away. But they keep following. And then they approach me.
I'm going to defend myself, right then and there. And I have every right to.
As does a grown man, a little old lady, and anyone else...including a teenage boy.
What if whomever is scaring you turns around and walk away from you? Are you going to defend yourself by attacking him once he is out of sight and you relocate him?
Probably not. But martin decided to go tracking his tracker. That is what got him killed.