It says Trayvon was in fear of an unknown man following him, tried to run home but was stopped by Zim who assumed Martin was trying to get away before the police arrived.
Zim could have simply followed Martin to where he was staying and waited for the police to show up as he told by the dispatcher a cop was being sent. But since Zim was a wannabe cop with a history of being confrontational (with a cop, his girlfriend, his cousin) AND WAS ARMED he took it upon himself to keep Martin from leaving the scene.
While Zim was on the phone w/ the dispatcher he described Martin (people like him) as an AH and a f.....ing punk, which tells you about his frame of mind.
Who was responsible for the incident happening in the first place? Unquestionably Zim, who followed Martin for no reason after being told not to.
The very idea that the DA assumes that he/she is capable of peering into Martin's brain and from that uncanny ability, constructs a hypothetical sequence of events and then elevates that thinking to the level of "evidence" is in itself standalone evidence on its face that the DA is incompetent. An affidavit is something you can or are willing to swear to. It is not a theory of the event. You cannot swear to a theory of an event. You can swear to what is your direct experience or observation. A theory does not belong on a document known as an "affidavit".
I hope someday we can break through the flaming levels of stupidity this case descends to, but I seriously doubt it.