Hmm... here's the Tracy Martin vid I think you're looking for: http://www.myfoxorlando.com/dpp/news/seminole_news/022712-man-shot-and-killed-in-neighborhood-alterc ation

He's not exactly right but it was good enough for an initial police report by a patrol officer. This ain't CSI Miami.  In a general sense, the body in the backyard of this unit, but it is a shared backyard.  

The yellow tarp may or may not cover the body, which may or may not have been moved out of the way.

If indeed GZ reached Retreat View while still on with dispatch, why not just give the address at that point?

Zimmerman asked for the police to call him as a change of mind, after first agreeing to the dispatcher's mailbox suggestion. This was near the end of the call.

It's a timing thing that makes me doubt the possibility of what you suggest about a route by the pond. I think the action at this time was that GZ was driving east on Twin trees, and TM was just starting to be running ahead east on Twin Trees, not YET onto the cut thru.  But both are past the first route to the pond.  

I'd put TM at or around J15-19 and GZ behind him but in motion.  TM stays to the left, northernmost lane to give the car a wide berth, and to make his surprise turn onto the cut thru sidewalk rapidly.  GZ stays in his lane moving slowly.  

GZ: Down towards the other [back] entrance.

I feel GZ is thinking like a driver, not a pedestrian.  Twin Trees runs east at the moment, but TM has stayed on it from the clubhouse through the first turn, where he passed GZ's vehicle.  GZ is giving general directions for a driver.  If it were a plumbing fixture, the teen is headed for the drain at the south.  I realize this is not a literal description but to my mind GZ is not the best navigator, either.  But that is where the street leads.

I think if the youth ducked behind the townhouse that backs onto the pond, he would have done so by cutting very close to GZ's vehicle and likely while it was already moving.   I don't see that as a probable action, and if it were the truth, then GZ would mention he was off the road and sidewalk and given a description that was more about the pond than about the back entrance.  His directions are in part to explain a route for the police to follow, so he uses streets directions.  I think "down" is not south, but "he's running down the street" (that eventually winds to the back entrance).  

THen we have the statement that GZ parked by a cut thru.  I think he has already made the distinction between "behind buildings" as super suspicious and would use that language if TM took a path that had no walkway.  Also, if he exited his vehicle and followed TM towards the pond at first he would say that too.  But I must admit we don't know any of this, really.  We are all speculating here.  My scenario is just the most direct route we can get to fit the ultimate location of the body and known clues like "returning to his truck" after first calculating how TM may have walked past GZ's car so quickly if GZ eventually is parked "by a cut thru."  That's what puts GZ's car in motion for me, the fact that he could watch him by the clubhouse at first, and then end up parked so far away.  

As for the foot chase, I think it is brief and occurs after the two first speak to one another, and the call to the girlfriend drops.  GZ has closed most of the gap between them already, and it is possible that TM meets him halfway.  The area between the back to back town houses was dark enough that the cops used flashlights, we have heard.  ( I doubt that from his car, in the dark and possible rain that GZ saw TM turn south off the cut thru path.)  I think there are pools of light and deep shadow.

After GZ completes the cut thru and is eventually returning west, he is able to backlight TM against someone's porch light by virtue of his tracking eye line.  On the way east, he was talking on the phone and not looking behind himself, but going west it's easy to spot the youth, who has not moved  - maybe he's under a patio or a tree to keep himself dry from the rain.  He's eluded his pursuer once by getting off the street, and possibly watched GZ pass east the first time, with or without knowing it was him.  I doubt TM looked back to see GZ exit his vehicle.  

Once GZ passed TM the first time,  this would indeed seem like the opportune moment to run for home, but remember he's talking to his girlfriend and thinks he's in a good hiding spot.  So he stays put.  When GZ was still in the car tailing him, TM had to consider the possibility that GZ would drive ahead to P23 and cut him off.  He's run to a place of refuge but not sanctuary.  TM may also have not wanted to lure a "stalker" to his own door, where the little kid was alone.   Or, he wanted provacy to complete his call.  My teen use our street as a place to talk on their cell phones at night...  we have a crowded house with little ears about.  

So my scenario is that the foot chase is brief, a little quarterback scramble where someone quickly falls to the ground, either slipping or being slung by the clothing, etc, a chase that occupies only three or four grid squares in a circle or something, ending where the body is found.  The location of the chase witness will tell us a lot if we ever learn it.  

This exchange from the bond hearing speaks to it, but is cut off:

DE LA RIONDA: Isn't it true, sir, that at least one witness described first chasing another person in the back of that --

GILBREATH: Yes.

I don't think "in the back of" refers to anything on Twin Trees, at least.  It could be on the cut thru, though.  But I doubt GZ was ever close to TM when he jogged away from his car, and it is also probable he had no view to see when TM turned south.  If he had, he would have followed that way.  If he parked  "by a cut thru" at J16-20, he can't see TM turn south until he himself is to i/J 23 or so.  

As for why GZ walks up north to where Retreat View turns back west ( D32 or so) when TM was seen running "down" I think GZ is just looking for all the possibilities considering he THINKS he has eliminated the idea that TM went into the dog walk area, having passed that already and seen nothing.  He looked down the  dimly lit sidewalk and didn't see the kid running there, so he continues east to Retreat view and looks N and south.  The nearest option from there is the corner to his north.  Once he's done that, in order to eliminate other possibilities he needs to go back to his truck after that, and drive around.  Or re-examine the dog walk.  

GZ's story is not that far from the truth, in many aspects.  He WAS headed back towards his vehicle when he was "surprised" to encounter TM, who may have spoken first.  The reason I think however that GZ is lying is that someone closed the gap  between the two by diverting from an innocent route and onto a course that intersects the other person's innocent route.  GZ's leads to his car, and TM's leads to his home.   Who closed the gap, then?

The location of the body seems to indicate that the diverting person was GZ and not TM.  If the fight was on the cut thru and the body found there, I would be inclined to believe GZ more.  I also think GZ DID get bested in the physical struggle to the extent that TM was on top and GZ was possibly the one yelling for help.  It's also possible TM was on top and yelling for help.  We don't know and the evidence is inconclusive at present, audio analysis or not.  (I do wonder why the lawyers/ spokespersons for Trayvon's family are not going forward to supply a voice sample for Trayvon to the press.)

So the situation is nuanced somewhat - TM fought GZ, I think.  How well we don't yet know.  But at the point, GZ lost his right to claim self defense by virtue of having tried to "detain/ arrest" the youth.  I don't know how you prove this in court, but that's what I think happened.  

I think the location of the body and the two person footchase witness may be enough to show that GZ is not a credible witness, and the jury will have to assume that GZ's account is a false one.  

Okay, last questions

"If indeed GZ reached Retreat View while still on with dispatch, why not just give the address at that point?"

He wasn't even thinking about addresses at that point.  The whole angle about looking for a street sign is an alibi to explain how he was NOT in pursuit of the teen, concocted after the shooting.  He gave adequate direction to his vehicle already, and was told he would he called when cops arrived.  The change in plan from "meet me at my car/mailboxes" to "call me and I'll let you know" don't seem to be something that paints him in a good light.  It can be argued that this is his signal that he will be on the hunt instead of waiting for the police to arrive.  

Why indeed did he not call in a street address in the minutes after he ended the call?  To me it's a suspicious action on top of the already TOTALLY ludicrous notion that he was "looking for street sign" at all.  He fully admitted he was out of his car chasing the youth in the call.  ("Are you following him?" A: Yes.)

However, later at the police station he may or may not have recalled all that he said to the operator, and so his alibi seems plausible to him.  (probable Q: Why did you get out of your car? What were you dong all the way over there? A:  I'd lost him by then, and I wasn't even looking for him anymore... I was on my way back to my truck, you see.  I went on to the next street because I wanted to find a street sign so the cops could meet me.")  And once he said it, he's locked into it.  We don't know when this portion of the story enters his statements however.  It seems he was out of the police station by 10 or 11PM, and for what it is worth the police report of Tim Smith isn't filed until 3AM.  Some people suspect that this report was prepared carefully to include exculpatory details and possibly with the hand of GZ and his allies.  I have no proof of that, but it is possible.  There is also a bit of curious document-handling possible hanky-panky regarding Smith's report you can read about here:

http://www.dailykos.com/story/2012/04/01/1079671/-Three-versions-of-Police-Report-Trayvon-Martin

We also know that the next day GZ walked the scene with investigators and that his father was present.  Did the "looking for a street sign" detail come in this late, after consideration and consultation of the law?  We don't know.  The possible  existence of evolving levels of exculpatory details are going to be interesting to examine once we have access to all the five accounts GZ gave the initial investigators.  I think GZ piles them on a little deep in the bovine extract department, up to and including "you got me" as the teen dies.  The part where GZ is threatened verbally with death by a kid who has yet to get his gun away from him seems highly implausible.  (If I were a suddenly murderous skittle-carrier, I'd wait until I had disarmed the man to utter lines from B-movies. )   I realize I am biased here but this is an open thread and I just don't find GZ credible at all.  

last question. (whew)

"And, I'll ask one more for now: Would TM really stop to talk on the phone for that length of time at the time you suggest, when he's trying to both evade GZ and get home?"

A: yes.  He waited out the rain before by the clubhouse, and now he was doing it again.  The call was still going at something around two minutes, when he'd been chatting all night, and something exciting had just happened to him.   We heard from DeeDee that the call was still going on when the two spoke and the call was dropped.  TM knew he wasn't doing anything wrong, and while he wanted to elude the car he had no idea that he was in physical danger yet.  I think his level of anxiety and fear skyrocketed after GZ closed the gap and the two began their foot chase and physical struggle.  

We won't ever know how the fight began, and the prosecution admits as much. (We do seem to know where it ended.)  Maybe GZ WAS sucker-punched.  But GZ seems to have closed the gap after getting out of his car, and pursuing in a general sense, and closed the gap in a specific "last-moments" sense if we consider the location of the body and the innocent path vs the intersecting path of each person, and that means he cannot claim self-defense without a great lawyer and no close-order foot chase.  It's his credibility that will crack his defense, not the details of what his account is.  

It's going to be a fascinating case.  It's already a sad shame that lies somewhere on a line that runs from "preventable tragedy" to "murder with police coverup."   And the blame for both begins with GZ getting out of his car with a loaded gun.  Whether it fits the exact legalities or not, expect to hear a lot form the prosecution about this.  GZ got out of his car with a loaded weapon - and one in the chamber, too it seems.

The grid has a minor flaw. The numbers 17 and 18 straddle lines, and the number 19 labels the interval that should have been 18. Not a problem most of the time, but it might trip you up if you're not aware of it.

That's because of the font/ font size, i.e., the spacings, how it's spaced. I've run into the same problem myself at times & probably most people have run into the same thing at one time or another whether they're working on a diagram or not.  

It's still a very helpful diagram.