You could very well be correct when it comes to a conviction. If I were the Defense Atty I would really hammer away at the fact that Zimmerman had broken off the pursuit and was jumped from behind. Indeed, that is the only defense he has ... but it could be a good defense if I could find the facts to support that theory.
Again .... probable cause is light years different from “beyond a reasonable doubt”.
The recording certainly indicates that. Wind noise from George's mouthpiece stops almost immediately after this exchange, DISPATCHER: "we don't need you to do that", GZ:"OK".
I believe any attempt made by the prosecution to make hay with the whole "pursuit" angle, is easily dispatched with an earlier portion of the tape. DISPATCHER:"Just let me know if this guy does anything else." GZ:"OK". More importantly it shows that George followed instruction. First to 'keep an eye on' then to stop pursuit when the 'suggestion' was made.