Explaining Virals on Instagram: "A backdraft happens when a fire in a closed or poorly ventilated space consumes most of the available oxygen but continues to smolder, producing heat and a buildup of flammable gases like carbon monoxide, hydrogen, and unburned hydrocarbons. The fire appears to die down, but the heat and gases remain trapped. When a door, window, or opening is suddenly introduced—like when firefighters or a person opens a door—fresh oxygen rushes in. This sudden oxygen supply mix