re: Close up video of first shooting

I had to watch it a few times. Thug chased kid between cars and was about to tackle him when kid unloaded then ran back around the car to check on him. He then called someone.

How did kid get separated from his group? Early on there was a man that seemed to be looking out for him and pulled him back from a group and admonished him about something. Who was he and where did he go?