My view is that Cpt. Zimmerman was conducting his duties as an officer in the Neighborhood Watch and observed Trayvon Martin wearing his hoodie, tattoos, gold teeth and casing houses.
If you listen to the 911 tape, Cpt. Zimmerman reports that Trayvon was walking, looking at houses and looking suspicious.
Cpt. Zimmerman, fulfilling his duty began to question Martin when Trayvon violently attacked Zimmerman.
Ah. I see. Well, let’s not waste electrons, then.
Why do you call him Cpt Zimmerman?