There was plenty of time and chances for him to stop running and stopping fighting back.
For some reason I doubt they just picked a random on the street and started chasing after him.
Also, this video should be a drinking game when it comes to "Which alternative should we use before shooting?"
Taser? Bottom's up.
Pepper Spray? Bottom's up, hickup..
Try to physically subdue? Bottmmm... up..
Heck... street brawl the person? Too drunk for this shit.