This system was designed to combat car jacking by shooting a jet of flames at anyone standing next to either side of the car.
From the YouTube description:
When this foot switch is pressed, two things happen. One, a 14-thousand volt spark would appear here in this nozzle, and then you have these four jets here shooting out gas. Liquid gas from the gas bottle in the boot. Liquid gas, as soon as it exits over the spark here, will ignite and a ball of flame will shoot out of both side of the vehicle. Incapacitating the hijackers immediately."
Amazingly perhaps, the system's legal in South Africa – provided the driver is acting in self defence as depicted in this mock-up.