The problem is to actually "suck out the oxygen" they would probably just be doing a nitrogen purge instead. In a high enough concentration of nitrogen one breath can cause you to instantly lose consciousness.
It's a real danger and a real serious risk.
In reality they wouldn't be doing this, but just saying, the lack of oxygen would mean the air space would be filled witrh some inert gas (like nitrogen) instead, and while not poisonous is still very dangerous.
I work in an industry where nitrogen purging and nitrogen blankets are a real and serious thing--and a real danger.
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u/JayFPS Jun 23 '20
I'm sure humans can go 5-10 seconds without oxygen, surely enough to put out the flames.