Nope, this is very simple for "security" guards in the role of protective detail:
Don't get involved in **** and if **** is going down, GTFO with your charges. At least to a minimum distance where they can still do their job, but your primary and sole purpose in life was to protect that news crew and get them out of danger if it was coming towards them.
Did that shooting seem like he was protecting anyone?
I have this theory he wasn't there with any "news crew." Why did the "producer" get taken into custody immediately afterwards? Why has no footage from 9News been released of the incident leading up to the shooting? If a "producer" was right there when the shooting happened, the reporter and camera operator would have been there as well. With a very loud incident going down between two people, you damn well know the camera would be running even if for B roll footage.
Pinkerton has some pretty interesting questions to answer for certain over their choice of "security" they hire and send out. My question for the news station is not "why would you hire an unlicensed guard?" It's "what was that crew doing there and why were they not recording anything?"
No, I have this feeling the shooter and "producer" were out there on their own accord.