The mediators writing to the judge about the reality of the case

Question:
If the mediators see that one of the disputing parties is tyrannical or aggressive toward his opponent, and the second party is in the right as the mediators see it, is it permissible for them to write to the judge of the case and explain the reality? And is this considered evidence that the judge should act upon?

Answer:
No, they do not testify before they are called to do so. The judge is the one who requests them. If the judge requests them and they have testimony, they do not conceal it. Whoever conceals testimony, his heart is sinful. If the judge asks them for testimony or inquires about what they know, they clarify this. However, if he does not ask them, they do not interfere with the judge. Yes.