There was some liquid that spread out on the floor just before the fire.
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One summer, I was teaching my wife and 4 kids the use of shotguns on moving targets. So we shot 4 to 5 hundred rounds of 20 gauge behind the farmhouse. The next spring the grass grew twice as fast and twice as thick as other grass, it all centered on our firing point! Lots of unburnt powder in every round.
Ivan
That's not liquid. That the fire starting below the floor boards. looks like some kind of hardwood floor that is above the sub floor. You can see the fire starting between the wooden floor slats.
It's the best part of the video. Notice how the fire spreads under the floor boards. The wide gaps in the boards made sweeping the floor totally ineffective and just provided space for large amounts of powder to collect between the boards and subfloor.