You left out an important step. You said "confronts...and then shoots" yet all accounts state that there was some sort of physical fight before the shooting. Why did you leave out the fight? Are you deliberately lying in service to some agenda?
We don’t know what happened physically between the two. Not even the eyewitnesses seem to be sure what happened.
All we know is a “self-appointed neighborhood watchman” became suspicious of a teen in his neighborhood, pursued him, confronted him, and shot and killed him. We also know that the teen was unarmed and that he hadn’t committed a crime, and all accounts so far say he had no criminal record.
OTOH, reports state that the “watchman” himself had been in trouble with the police.
Remember the story of Joe Horn, the man in Texas who shot and killed two men who’d just broken into his neighbor’s home? For the record, I was completely in support of what he did. But, this story is quite different. This teen hadn’t committed a crime. For all we know, he might’ve been afraid of the man following him. He himself might’ve been acting in self-defense. Whatever the case, he cannot tell us his side of the story now.