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~~What would be the best way to breath for a creature that shoots fire from its mouth~~

What would be the best way to breathe for a creature that shoots fire from its mouth?

I've had an idea where there's this humanoud based lifeform that has no real origin other than bring found on some remote island kind of like skull island and seems be a complete anomoly in the natural world, supposedly being the only one of his kind. Among his traits is that though complex systems of specialized organs that produce acetylene gas that gets pumped through a valve pipe in his throat with a bone like lighting mechanism to produce fire. Along with this he also a little organ that is strictly used to produce oxygen that when pushed through another pipe valve in his throat to generate a oxy-acetelyne based stream and cant be used for additional breathing.
The problem while I was designing this creature is while I initially wanted him to have a set of standard nostrils above his mouth like any other life form, it occured to me one day that the amount of fire and heat he'd be producing would definitely burn a good chunk of oxygen molecules in his path. So now the problem I'm facing is would he be able to breathe properly with how much heat his fire is producing. I have a few ideas on how to fix this issue, but that's only if the level of heat he produces actually has negative affects to the air he's breathing. Now he does travel about from jungles to cities to open plains so I'm barring variables like ashes and embers and such, I'm really just looking to see if I need to fix the way he breathes when he does his fire attacks or if just having standard nostrils will be fine since even though biologically speaking he is an entity that requires suspension of disbelief he's still bound by basic physics.

I've had an idea where there's this humanoid based life-form that has no real origin other than being found on some remote island. Kind of like skull island and seems be a complete anomaly in the natural world, supposedly being the only one of his kind.
Among his traits is that through complex systems of specialized organs that produce acetylene gas that gets pumped through a valve pipe in his throat with a bone like lighting mechanism to produce fire. Along with this he also has a little organ that is strictly used to produce oxygen that when pushed through another pipe valve in his throat generates a oxy-acetelyne (this is like the fuel for the fire) based stream and can't be used for additional breathing.
The problem while I was designing this creature is while I initially wanted him to have a set of standard nostrils above his mouth like any other life form, it occurred to me one day that the amount of fire and heat he'd be producing would definitely burn a good chunk of oxygen molecules in his path.
So now the problem I'm facing is would he be able to breathe properly with how much heat his fire is producing?
I have a few ideas on how to fix this issue, but that's only if the level of heat he produces actually has negative effects to the air he's breathing.
Now he does travel about from jungles to cities to open plains so I'm barring variables like ashes and embers and such, I'm really just looking to see if I need to fix the way he breathes when he does his fire attacks or if just having standard nostrils will be fine since even though biologically speaking he is an entity that requires suspension of disbelief he's still bound by basic physics.
In short:
* Known world physics
* Humanoid creature but a one-of-a-kind anomaly
* Able to create fire from organs
* What about the breathing process through nostrils?
* Asking for biological or conceptual inputs

worldbuilding

Communities

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