"Not sure wtf was going on with an R44 on the south side at about 500' while the pair of Mirages were waxing the place!"
To answer that question, it was on a scheduled photo sortie to cover the site and I was the photographer! We stayed south of the display line at all times whilst Ramex Delta operated to the north but I can assure you we were both keeping a good lookout! ATC asked us to hold at that altitude until we could recover back to the north.