Using fire as planned -> accidentally setting something else on fire that stays contained in a small area -> “wow that’s staying alight for longer than wood. Wonder what else does that” = the first experimental pyromaniac is created -> they talk about what they do -> others “cool. Sounds interesting. Mmmm wonder what happened if I give it a go”
Other alternative is they notice things with animal fats on them burn for a longer time and take it from there
Likely a bit of both and other things too
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