I don't believe that GZ ever said that he walked up to the car, stared at him and then took off running. But even if it had happened that way, thinking as an adult, if a kid was being watched, then that kid stops to look at who was in the car watching him, the kid doesn't recognize the person and then takes off running, two thoughts would immediately come to my mind, the kid was stopping to see who it was that following him, perhaps to see if he recognized the person inside the can. Then seeing that the person following and watching from in the car was a stranger, running away would be because he was in fact some random stranger that was following him. The fact that he ran away would show he wanted to get away from this stranger. But if Trayvon's running away from GZ made him more suspicious then how can it also be said that him not running, not running fast enough, or not getting home fast enough also made him suspicious?