The point of this being:
A) It is an offence to discharge a firearm (this includes airweapons) within 50ft, of the centre of "The Queens Highway".
B) It is an offence, for an unauthorised person, to have any airweapon, in a public place, whether it be loaded or not, if it isnt securely covered, so that it may not be fired.
C) Unless they had the permission of the land owner, apon who's land, they were allegedly parked, they also committed armed tresspass.
I would be inclined, to report the video taped evidence to the authorities.