Not all fires do burn in the visual spectrum. Some time ago formula cars ran on methanol, which burns clear. Back then the cars were allowed to refuel at pitstops, and sometimes things didn’t go perfectly. Enough people burned to death in invisible fires that they developed a very overt dance to indicate to the rest of the pit “I am on fire, please come put me out at your earliest convenience.”
Youtube has lots of footage of people dancing the dance and then getting dowsed by support staff.
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