There is nothing illegal about approaching a stranger in your complex if you are on watch patrol. Its not illegal to follow someone either as long as you don’t threaten them. However it is illegal to physically assault someone to the point that they are forced to shoot you.
There is a difference between approaching someone in broad daylight to ask a question and following/chasing someone at night through the rain. The first is civil, the second is belligerent.
There is a difference between approaching someone in broad daylight to ask a question and following/chasing someone at night through the rain. The first is civil, the second is belligerent and provocative and would scare the "average man" for his safety.
The place has side walks all over, so what are they there, to look at.