I dunno, methane isn't very energy dense. It's hard for me to imagine the fire spreading unless the methane was already in very dangerous concentrations. But

I dunno, methane isn't very energy dense. It's hard for me to imagine the fire spreading unless the methane was already in very dangerous concentrations. But I don't know! Seems worth investigating. Also, what would be the risk of something like that perturbing larger bubbles and causing an eruption, like a popping balloon?