With the caveat I'm not a qualified pilot albeit with a little bit of UAS flying I can add that I saw the incident in person and was standing at a different angle to the one the videos are showing which gave me a slightly different visual perspective. Just after the syncro pair crossed over the aircraft was turning tightly to the left with a bank of maybe 60 degrees. I was tail on to the aircraft with a raised vantage point. The aircraft clearly jinked left and then right hard in quick succession as if the pilot was struggling with something. It looked odd because until then all of the turns had been smooth and I got the impression that something was wrong. Immediately after it dropped down and you have seen the rest on video.
My thoughts are with the pilot and his friends and family of course. Tragic.