As far as escalation goes, the point that I (and others) are trying to make is that a private property owner or their representative is absolutely within their rights to confront and question someone on that property, and a gated community is private property. There's a right way to do it and a wrong way to do it, but in and of itself it's not escalation.....no more so than if I went out to someone standing on my lawn and asked them what they were doing. Of course if I chose to confront that person by charging out of my house with fists flying then I'd be in the wrong. Maybe that's what Zimmerman did, maybe not.
Again, it's what transpired after the initial contact between the two that's the real question.