This is horrible all around. In my CHL class the instructor covered a similar scenario (after a defensive shooting), where 3 officers give 3 very conflicting verbal commands simultaneously. Something like "freeze", "drop it", and "get on the ground". We were taught to just freeze until the officers figured out and agreed upon what they wanted you to do. That makes sense to me, since not moving is further away from making an aggressive movement than moving at all is.
I personally assume that "going berzerk" = victim telling employee they can't legally deny him from carrying in their store.
Would love to see the video of his berzerking. Would also love to see it come down on whoever called it in's head if s/he exaggerated it.