Saw the Naga fireballs at Nong Khai with my own eyes and I still can't explain them

every year, end of Buddhist Lent, full moon of the 11th lunar month, on the Mekong at Nong Khai and across the Phon Phisai side, these reddish-pink balls of fire rise straight up out of the river. silent. no smoke, no arc, they just go up and vanish. locals say it's the Phaya Naga, the great serpent……