I'm wondering about that too. Are we talking about two different conversations and two different edits?
First time I've seen this conversation:
Zimmerman: This guy looks like he’s up to no good or on drugs or something. He’s got his hand in his waistband. And he’s a black male. Dispatcher: Are you following him?
And its "edited" version. Unless that's an edit of an earlier edited version. Maybe at the trial the judge and jury will hear the entire conversation and not N.B.C.s version.
This is, believe it or not, a different malicious edit of the same passage.
The one you are thinking about is the first one, where they left out the question from the dispatcher.
This second malicious edit is even more damnable and impossible to deny — she took this “waistband” clip from much later in the clip and inserted it into the early part of the conversation.