Did you understand the communication being made? Clearly so. Looks like I used adequate wording.

Getting high oxygen isn't enough, you need propane purity and oxidizer purity (the not air inert gas and oxygen mix) or you get unburnt products. You also need perfect mixing, and essentially an adiabatic chamber. There is no combustion chamber on this earth outside of some absurd combustion lab that doesn't have soot buildup.

Not things you'd find in a dusty standard ass DND dungeon. But please continue bending over backwards to justify why you couldn't just day "you didn't think anything of it"