Perhaps he was concerned about leading the guy who was stalking him back to his house. Just imagine if it was a nice white guy who got shot by zimmerman.<quoted text>
Actually it wasn't. Zimmerman first followed Martin in his car and called a nonemergency police number to report what he felt was suspicious activity. While on the phone Martin came up to the car and Zimmerman closed his window to avoid a direct confrontation. He then followed Martin while still talking to the operator who said "Okay, we don't need you to do that" at which point Zimmerman said "Yeah" and you can hear in the recording that his breathing changed indicating that he had stopped trying to follow Martin.
At this point Martin had gotten away. No one was following him. He had more than enough time to get home. So what did he do instead? The evidence supported Zimmerman's claim that he was attacked. You can't claim self defense for Martin when it looks like he instigated the attack.
Headline: "Hispanic wannabe cop hunts and kills child."