I am not certain about this particular incident but you hear "we are out of water" alot on a fire scene. If the attack pumper is being nursed by other pumpers this usually means the truck feeding the attack pumper is out and they need to hook up a new truck. The attack pumper can still use it's onboard water suply to contnue the attack so it doesn't mean you are totally out of water. The SO deputy that called it in said the structure was already "fully involved" before the FD's tones even dropped. A temporary loss of water supply would not have made a difference anyway.