cornering them in a blind alley
There was no blind alley, you're making that up.
And he wasn't "cornered," because he just kept walking towards his relative's house, while Zimmerman was headed the opposite way, back to his truck. So you're making that up, too.
Yes, hunting groceries. At the grocery store, where he was headed.
he contradicted the 911 tapes multiple times
You mean, the sort of 911 tapes that NBC edited to change their entire context? Because that seems to be the sort of thing that has established your narrative, here.
And why did he get out of his car to look for a street sign on a different street to tell the 911 operator where to find him after he hung up and help was already on the way?
Because just like you, and me, and everyone else, it occurred to him after he got off the phone, that there might be more information needed.
It's not like telling them the name of the wrong street would help anyway
True. Cops much prefer to be told where to look for possible burglars via as much vague, imprecise blather as possible. They HATE it when you tell them things like which street you saw someone walking on, heading which direction, that sort of thing. Their jobs are much easier if you make it take as long as possible to figure out where someone is.
Oh, and the head of the neighborhood watch getting "lost" one block from home on streets he patrols daily doesn't sound very likely
It's a good thing he wasn't lost, then.
Especially in a gated community with only a few streets in the first place.
Yes, a gated community that had been seeing a rash of break-ins. Which is exactly why the possibility that the unfamiliar person hiding their face and cutting through the neighborhood at night inspires a call to the police, and an urge to give them as much info as possible. Because that gated community was becoming a regular shopping mall for one or more burglars.