Actually, someone else has pointed out that although the dispatcher told him he didn’t need to follow, it may have been more along the lines of this:
A perfect example of this was a recent case where a single mother shot and killed a man who was breaking into the mothers home with an accomplice. The mother was armed and asked the 911 operator if she could shoot the intruder. The 911 operator stated “I can’t tell you to do that but you do what you have to do to protect your baby” (not and exact quote but close). In other words we can’t tell you to shoot this guy but if he gets in shoot him.
I saw that post, but I don’t buy it. Two completely different cases. One was a woman having her door busted down by someone. No time for police and her life was in imminent danger. At first Zimmerman was in no imminent danger and was just following him and reported it to the police. What happened afterwards is the question.