sparking?
Dunno; I've seen that kind of nearly spherical effect in videos of engines stuttering as well; puffs of vapor of some kind igniting? They're intermittent in the video, the last bright stuff, toward the end. I asked because it appears to begin about the time the aircraft seems to be dragging the right wing a bit. Trust me, I'm utterly ignorant about this vehicle, just asking whether there are two different things going on in the film --- the big shower of hot metal sparks is quite recognizable from the beginning contact; the little round fireball things occur as that's about over, just at the end. Engine backfiring from being banged hard? Just curious.