What is the most immediate and dangerous consequence of suddenly introducing oxygen to a superheated, ventilation-limited compartment fire?

The most immediate and dangerous consequence of suddenly introducing oxygen to a superheated, ventilation-limited compartment fire is a backdraft. A superheated, ventilation-limited compartment fire describes a scenario where an enclosed space contains a fire that has consumed most of the available oxygen but still has abundant fuel. "Superheated" means the temperature within the compartment, including the accumulated gases and surfaces, is extremely high, often well above the ignition temperature of the ....