WHO WERE THOSE PEOPLE -- OR DID WITNESS 11 LIE?

From the timeline here we learn that Dee Dee's call ends at 7:16:xx ; because T-Mobile doesn't give seconds data,  it could have been anytime from 7:16:00 to 7:16:59.
[more on the gap timing here ]

Okay,  BUT,  there's a 911 call made that picks up at 7:16:11  so by that we know that Dee Dee's call had to drop at sometime between 7:16:00 and 7:16:10 .

Most importantly about this 911 call picking up voices that are presumably Trayvon Martin and George Zimmerman in close contact with each other,  it also firmly establishes their location at 7:16:11 where the two are in close proximity to one another.

Since Dee Dee's call is not recorded,  we cannot tell from which direction they arrived there,  but we do know,  without any possibility of doubt,  that they are at this location,  at this time,  and that they do not move from that location,  because the gunshot happens right there.

This is where the trouble starts,  but first things first.  We need to know one more thing before we get to the problem.

WHICH DIRECTION DID TRAYVON AND ZIMMERMAN COME THERE FROM?
To answer that question we turn to videographer LLMPapa's YouTube video titled:
"EVIDENCE OF DIRECTION"  HERE:

This video,  based on witness testimony,  clearly shows that the direction of travel before contact
was made,  was definitively south to north.

So,  now we've firmly established that the parties moved from south to north,  before Dee Dee's call dropped and the first 911 call picked them up at that location.

Now,  at this same time,  we have a witness,  WITNESS 11,  telling us of a loud argument she heard,  that moved from the northern walkway and moved towards the T,  and "bent the corner" moving south.
Since this is happening at the very same time that we have Trayvon Martin and George Zimmerman located near the first 911 callers phone,   who are the people making the noises that Witness 11 is claiming to have heard?

Here's another videographers rendition of witness 11's testimony:

BY STATEOFTHEINTERNET - TRENT SAWYER

So,  just to be clear,  unless some other explanation can be found for this data,  either witness 11 is lying or,  there was another group of people out there,  arguing loudly and moving towards where Trayvon and Zimmerman were in contact,  and before the gunshot was fired.

I'll leave to you other sleuths out there to try and determine how to resolve this dilemma.