Here is a link to the "Tether Incident" where a much greater potential difference is induced than predicted, causing it to separate.
What follows is of importance.
Question is out of focus space debris/ice crystals that are close to the lens that are affected by shuttle's thrusters or intelligently moving objects, and at sizes upto 3km in diameter passing clearly behind the 20km tether?
You put your finger on a crucial point -- what is the source of the illumination of the particles?
In the prosaic model, they are just sunlit.
In non-prosaic models, they are self-illuminating, as your words suggest.
So the question is always, with such videos -- was the sun 'out', or not?
It's not as easy as one might think to determine this based merely on the scene. Stars can be 'out' in daylight, in the vacuum of space. The Earth below can be still dark, if it's soon after orbital sunris