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https://youtu.be/R_A0iNODJhU (caution language)
The articles I've read stated he had run to a neighborhood by himself and asked a resident for some help. It would seem weird for his own "friends" in the SUV to leave him like that. Maybe he really isn't even in this video.
The truth will all come out. Lots of people cruising around the white shirted shooter, someone will give up his name and the story will unfold.