Playing it back on a 27' screen with the sound medium, at 22secs you can hear a metallic scraping noise and can see the thin earth line lower with the aircraft, as if it has been struck.
Just before the noise, there is a puff of smoke from just in front of the trgb.
The earth line is very hard to see on a smaller screen, but you have the double line at the bottom of this screenshot, two singles above that and then the near invisible earth line caught somewhere on the ac.
Looks to me, and is just my opinion based on what I see and I appreciate others view will be different, as if the ac is crossing the wires at an angle in the descent and caught the tail/trgb on the earth wire.
RiP
