Kung Fu master able to breathe fire with just a mouthful of sawdust

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There's probably a hot ember in the sawdust he packed in his mouth. (the sawdust contains both the smoke and the heat) When he exhales, the ember starts to consume the surrounding sawdust with the oxygen provided. He maintains the fire controlling the oxygen supply. If it's out of control, he smothers it with compressed sawdust.

I'm a pyromaniac since almost 3 decades, and I am confident in my analysis.

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The chances are the sawdust is in fact lycopodium powder , its been used for over a 100 years for theatrical fire effects,
the bowl most likely has buried in it a hidden mouth guard and when he stuffs his mouth with powder he inserts it hiding it with more powder,
in the mouth piece is hidden a capsule of potassium permanganate and glycerine, this ignites after 20 -30 seconds starting a reaction with the lycopodium , and the fan adds oxygen to the powder,
the flame created at the end shows better combustion of the fuel.

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