In the video, you can see the gas company employees placing the ladder and pulling the hose that runs from the unit with the pipe. In an instant, the hose apparently ruptured, and it shot out; even the final section of the hose, where the dispensing pump is located, was about to hit another worker, who quickly covered his head and ran, as did the owner of the house.
Minutes later, another worker ran to the unit and closed the valve, stopping the LP gas emissions and preventing the leak from continuing.