That’s a pretty good video of the shooting. Starting at about -1:20. Shows the shooter (long rifle) running away from one guy chasing him - I presume the chaser is the guy shot in the head.
Then comes the armed guy with the medical bag and is on the phone (other video shows better). But he runs off.
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At about 3:59:00
Thug chasing dude with gun
Thug throws something at dude.
Dude turns and fires warning shot, and continues running.
Thug stops, briefly, and continues chase
Dude (???) fires three (??) shots.
Thug is laid out
Looked like self defence and running for your life