fine, the Mekong fireballs aren't the naga. but explain Phaya Nak to me anyway

Yeah yeah I know we're 'supposed to avoid' the fireball thing, everyone's beaten it to death, the dredged-up explanation is methane / a Lao army guy firing tracer rounds across the river, whatever. I'm not even talking about the lights. I'm talking about Phaya Nak himself, the river serpent the whol……