This is a wide-angle view—so yes, it was nearby, and loud. [Worry not, I was in shelter of a well-grounded structure with good outside view.] A single source, connected somewhere high in the trailing precipitation region of a squall line, triggered an instant, multichannel cloud-to-ground discharge. At such close range, with high origin and no obscuring by clouds, the deeply detailed, beautifully intricate structure of both the successful step leaders and their forks can be seen. Three of the channels grounded at once (two of them branching low in the middle), with the one on the left apparently accepting the most up-rushing current. I was about ready to pack up and leave after about an hour of shooting, with nothing special to show for it, thanks to a bunch of intracloud flashes and distant CGs hidden behind low clouds. Fortunately this lone flash made the entire effort worthwhile.
Norman OK (23 Apr 21) Looking SE
35.2014, -97.4416