Methane gas (swamp gas)
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18mm - f.22 - 1/80 sec - ISO 200 - Tripod - Wireless trigger - Circular Polarising
The rotting leaf creates methane gas that gets trapped in the ice, like gaspockets. When you make a little hole in the pocket, and lights it, it burns. I use a match. (No manipulation)
Psa 105:39 God put a cloud over his people and a fire at night to give them light.