I doubt that. I've never made a 911 call, but I'm familiar enough with police policy that, if I called 911 and received that advice, I'd take it as an admonition to leave pursuit to the officers when they arrive. Certainly, George Zimmerman, a wannabe cop who has made 46 calls to 911 since 2004, would have a similar understanding.
Indeed, Zimmerman responded "OK" to the dispatcher's advice. And it seems that, in fact, he did break off following Martin, and he stated that he had lost Martin. But, unfortunately, Martin had not lost Zimmerman and apparently decided to teach him a lesson about profiling and disrespect in an unlawful manner, not considering that the object of his lesson might be armed.
He did not call 911. He called the non-emergency number. This is the number you call to report suspicious activity. The military has the same set up and I have used it last year. Some clown was taking photos where he was not supposed to.
The first question they will ask is if you are calling to report a crime in progress.