My question involves juvenile law in the State of: Oregon

My son was at a football camp this past summer with his team, and got into a physical confrontation with one of his own teamates. He pushed the boy twice, and the boy punched him first and then they started punching eachother. The boy got 2 lacerations to the head requiring 4 staples to one and 5 staples to the other. And a laceration to the nose which was super-glued.

My son, was arrested for 3rd degree assault, harrassment, and menacing. Which the assault was dropped to assault 4 and now no harrassment or menacing. He was taken to the juvenile authorities in a different county in our state and transferred to our county with a total of 2 and half days. Then was released to us but under house arrest...which is continuing as of now. This happend on July 13th and its September 23rd.

We are requesting a hearing before the judge which will happen on November 5th.

My question is....why is it that if the other boy threw the first punch that he is not being charged? What are my son's chances of this being dropped even more? My son admits to harrassment...(pushed him twice) but did not assault him first. What can I do to prepare myself for November 5th?? If anything??