Maybe he did. Maybe he didn't. It's not proven he did not heed the dispatcher. Even so, it doesn't matter.
Even if he didn't heed the dispatcher, following somebody in and of itself while on the phone to the police is not criminal conduct. It's not illegal. There is no proof that George Zimmerman initiated any confrontation or attacked Martin, which is the major key in a manslaughter case. There is proof that Martin decked Zimmerman and was slamming his head against the concrete, and possibly going after Z's gun.
It’s astonishing that most of the things in the charging document are not illegal. “Profiling” is not only not illegal, it’s smart. Following suspicious characters is legal, and brave. Shooting a guy who’s beating your head in is legal, and smart.
There’s nothing here.