That is what I thought as well, Darrin - but am surprised there is such a small amount of flame at the muzzle - much more from the vent. That could be blow-by - or not. If not and is actual muzzle flash from behind the ball, it must have been a tiny charge and it seems most of it came out the vent. At that stage of vent blow, I would have expected the ball to be well gone, but see none of the normal bright muzzle sparks.
All this shows quite well on my monitor. My old one, a much smaller 19" monitor would not show what I am referring to, very well. As Dennis noted, enlarging the picture makes it easier to see.
Good to see you back on the board, Dennis.