What is a Horizon of Understanding and how can it be applied to understanding the Bible?

In the court room, the jury cannot deliberate until the defense rests. The one tasked with communicating the defense is the judge if adequate information has been given for the jury to deliberate.

In polite conversation, one repeats back what he thinks he has heard, giving the speaker an opportunity to correct any misunderstanding, before the hearer contradicts the claims.

These roles are played by someone holding an alternate view than the one being considered. They speak as a proxy for the author, not by representing the author's actual horizon, but by stretching yours so that it might intersect the author's.

Nothing is learned when when all the voices say the same thing.

This is too long as a comment and not sufficient for an answer, so I guess it is a suggestion to add some of it to the application portion of your answer if you like it. Then delete this one.