This witness interviewed in the video below from around the 40s mark states more or less that of four aircraft in low level formation broke one left , one right and one "up" to do a vertical loop . He does not state what the fourth did . It was the one that did a vertical loop that crashed he says not having time / height to recover and impacted the ground. He doesn't state in what attitude the impact was but does emphasis that it had no recovered level flight. The debris field as shown does not seem over a long distance.
https://www.youtube.com/watch?time_c...&v=iiSrLOoRN48