[adhesive_wombat]

The animation, not the static image, covers clouds moving from North Texas to South Texas. That must cover hours, and each frame seems to be a merge between many flashes.

The static image below that, of the record duration flash from South America, shows what does look like a single dendritic lightning flash.

[jagged-chisel]

I assume one of those frames includes the megaflash. But they didn’t tell us which.