Hi Kuu
The point is that people should be taught how to re thread the rope and either lower off, or abseil, once the party have finished climbing on that anchor.
If the second person doesn't know how to do so, and is keen to learn, teach them (preferably well, with a dry run on the ground, etc etc).
If the second person is not comfortable doing this (eg; you are runnig a top rope for someone), then you should climb back up and re thread the rope yourself.
No need to leave biners behind when you have finished.
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