[Ice Czar]

Originally Posted by keykeeper

Remove any of the 3 required components from the equation, and the flame disappears. Thus the importance to firefighters.

a useful simplification for firefighters, the general public and children
it might be more useful to consider combustion instead of fire

Combustion or burning is a complex sequence of exothermic chemical reactions between a fuel and an oxidant

while its useful to keep most fuels below an energy level where they will ignite
heat is a by product of fire, not necessarily a limiting factor to a chemical chain reaction that is supplying its own heat

accompanied by the production of heat or both heat and light in the form of either a glow or flames.

Direct combustion by atmospheric oxygen is a reaction mediated by radical intermediates. The conditions for radical production are naturally produced by thermal runaway, where the heat generated by combustion is necessary to maintain the high temperature necessary for radical production.

atmospheric oxygen isn't even necessary, take for instance thermite
aluminum is the fuel, and rust the oxygen source. Or an oxy-fuel say hydrogen peroxide, at a 70–98+% concentration its a monopropellant the storage temperature of the fuel is immaterial as soon as the flame front arrives. You can't "remove" the heat.

Then there is another shade, autoignition, in say a diesel engine, or fire piston.
a change in pressure produces the heat for ignition

none of these shades of understanding violate the tripod\tetrahedron
just strech how most folks interpret it. Heating to an ignition point in particular can be nearly instantaneous and next to impossible to "remove"