It was speculation and a hunch.
I figure Martin would not have started beating him about the head while Zimmerman was on his back, if Zimmerman already had the weapon in his hand to begin with. That would seem very unlikely. Hence, he likely pulled and shot Martin while calling for help as he was being being beaten.
Agree, Zimmerman probably should have kept his distance, but I understand, Martin approached Zimmerman. Again, Martin likely would not have approached/attacked Zimmerman if Zimmerman already had the gun in his hand. This would seem very unlikely.
Just a hunch.
Based on my dealings with people, including quite a few sketchies, if you’re peaceful, they will be peaceful. While nothing is guaranteed, I have difficulty with the idea that Zimmerman was perfectly peaceful in his approach and Martin just simply spazzed out and started swinging.
That is not credible, imo.