I just saw the same stop-frame video on Fox. What looks like a plume in pic #3 wasn't moving, so disregard what I said about it in my paragraph #4.
I keep going back to the slo-mo pictures on
Florida Today's site. I noticed that in about frame 10 and 11 (if I am counting correctly) that there is a small plume that appears under the wing immediately before the large plume in appears in frames 12 & 13.
Am I seeing correctly? Is that an additional small plume or perhaps something in the background?