I don't think the murder was planned. I think the news people wanted to get some pushing, shoving and a few body blows for the a TV report. The crews had been sticking to the agitator like glue.
The agitator got the victim worked up and then it went off the rails. The victim caught wind of the TV reporter filming him with his phone. The victim was going to confront the TV reporter and the fake security guard tried to intervene. My take is shooter got ticked off the victim slapped him, lost his composer and shot him.
The Left is very highly organized and we ignore "coincidences" at our peril.