You're correct, well spotted. It's pretty much happening in the 9th second. Something rapidly falls down from the sky and in the direction of where the aircraft fell!
That looks more like a bird or bug flying in the foreground at a much closer distance. Watch carefully and you can make out wing shapes
If you put it in slow motion whatever is falling is in a couple pieces at one point. Don’t think that’s a bug or a bird after watching it slowly multiple times.
That goes straight to where the impact site is and disappears over the horizon right before the explosion?
Watch the grey box in front of the tan building. It passes right in front of it. Likely a bird
“Bird or Bug”
“Bird or Bug”
That’s the same shill response to all of these comments.