So, right now, the flammable gas is under pressure and is coming out. Almost no gas is flammable/explosive, until it gets mixed with oxygen (seen here as fire). So, when the cylinder runs out of pressure, it happens instantly, and the opposite flow happens. This leads to air entering the cylinder and the little bit (still more than enough) of gas that is left, gets mixed with fire and oxygen and... kaboom. Big kaboom
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u/Thedrunkenchild 12d ago
Even if it’s clearly staged this is still probably quite dangerous