Similar to nozzle used in Flashover Simulators designed in Sweden and used here. Have been around for years. Low flow, short bursts of the stream to "delay or kill" flahover. I worked for a while as an instructor in the Flashover Simulator classses. We would tell the student "pay no attention to the man with the nozzle" The techniquies i.e short bursts from the nozzle, were for the simulator not for real world firefighting.