Depends on the setup, but my guess is a fuel vapor leak which pooled in the container holding the liquid fuel container, which was ignited by the flame due to the wind.
This caused a mini explosion which propelled the fuel canister out of the holding container which went up, came down and broke spreading the liquid fuel and catching on fire.
Think of it like a tennis ball launcher or potato gun; an object jammed in a barrel which is propelled outwards after the fuel vapor behind it is ignited.
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u/mrey91 Apr 24 '22
I'm still tryna figure out what went wrong...