Could that 'flame' simply be a strobe flash and the coming angle simply the result of pulling anything that's left to get away from the water?
I thought it was strobe the first time I saw it. but a look at images online does not show one being there. Also the wrong side for the sun to have reflected off something.
However, if it was a flame I'm pretty sure there would have been an audible retort too, so hard to imagine why they would have continued?