Here's the other part of the law you're ignoring.
(4) If at any time after the onset of the temporary detention authorized by subsection (2), probable cause for arrest of person shall appear, the person shall be arrested. If, after an inquiry into the circumstances which prompted the temporary detention, no probable cause for the arrest of the person shall appear, the person shall be released.Zimmerman wasn't released. He was handcuffed and removed from the scene in a police car, therefore he was arrested according to the law -- the law of Florida, and the law according to the Constitution (look up Florida v Royer (1983)). Your use of caps lock doesn't negate that.
Based upon reasonable suspicion that you may be involved in criminal activity, a police officer may require you to identify yourself and explain your presence at a particular time, without arresting you. Under Florida law the officer may not remove you from the immediate vicinity without making an arrest, unless you voluntarily accompany the officer to some other location.