I agree with all . Zimmerman says on the tape the guy is up to no good, he might be on drugs, he is criminally motivated by looking at houses, he is reaching for a weapon in his waistband. This was a highly dangerous person to follow and ask questions to and Zimmerman by his own choice wants a piece of this action. No sane person would follow a person on drugs, who he thinks has a weapon unless he wants something bad to happen.
Or unless he is willing to put himself in harms way to prevent harm to others who have put their confidence in him as Neighborhood Watch.