Followup reporting indicates that he was not asked to guard the business that he was "protecting", that the business asked him and others not to get involved and they did anyway, and that he instigated the altercation with the men chasing him in the video.
Here's an interview with a reporter who was on scene and rendered aid to the first victim. He gives a minute by minute recount of what happened from his perspective.
The instigation that led to the second set of altercations isn't entirely clear.
It's not self-defense when you start the fight.