The are some over looked scenarios in my opinion.
When Martin was at the 7-11 the video shows that he wanted some thing behind the counter. The clerk indicated no. Can’t hear what they are saying but can see the hand motions. When Martin left He had his change and a Watermelon drink in a 7-11 plastic bag in him left hand. The next to enter the 7-11 were three people, one had bills in his hand. He purchased two cigars and paid from them with the bills in his hand. I think that the cigars are what the clerk would not sell Martin. Later the man purchased another cigar. This time he took money from his wallet to pay for it. Martin stayed out side the 7-11 for about 4 minutes and can be seen leaving after the three men left.
The 7-11 bag that contained the fruit drink was on the sidewalk where the confrontation started. Now this is only my opinion. Martin took the drink from the bag. Now he has two weapons. A cell phone and a drink can. I think the hit on the nose was a cell phone. Notice the marks. The bruise on his right forehead was the drink can. Notice the crescent mark of the bruise.
The blunt(s) that M may have had were not amongst his items found on the fight scene. It has been theorized that he perhaps toked up a blunt and smoked it on the way home. Another theory is that he hid his screwdriver/burglary tool in the buses near the fight scene on his first trip through. A further explanation suggests that he did go to his father's fiancee's residence, got rid of contraband there, then headed bac kto retrieve hos screwdriver, but ran into Z at the jucnture of his first track and Z's furthest advance. But now, it is simply a trail of fairy dust, which no one can ever know.
But it's over. The bottom line is that a citizen lawfully carrying a handgun effectively used it to thwart an unexpected criminal assault by an angry youth in the midst of the youth's attack.
Regardless of the reasons for the outcome, the youth deliberately initiated a murderous attack far beyond a mere confrontation. This is the central fact that must be asserted again and again, until the meme of "Z followed him" is submerged as not justifying a physical assault.