That's probably where Zimmerman turned around and began walking back to his car when he was caught from behind, knocked down from a single punch by Trayvon then his head was slammed into the sidewalk several times, leaving him bloody and battered.
Whether there are security cameras in this area is unclear, but it was definitely alluded to with the video report link from Ann Curry's interview.
For a birds-eye view of the location, use a real estate search engine like Zillow or Google earth and locate:
The clubhouse mentioned in the audio tapes in visible by the pool (on Retreat View Circle)
The pass through is visible by centering the map and zooming in to follow the sidewalk off of Twin Trees Lane on the left. It appears the confrontation took place in the area between Twin Trees Lane and Retreat View Circle in the area common to the back doors of each structure.
He lost sight of him and there he was again coming up from behind. Seems he’s the one doing the following. Did he say he was staring at him - couldn’t understand that.
No, the story says approached from behind, then they exchanged words, then Martin punched Zimmerman in the nose (all this is according to Zimmerman, but it fits the facts).