E.B.
I am not a public school teacher, though I have worked with other people's children most of my life through private school, preschool and childcare.
It is sad to me that this single incident has to be treated with a blanket rule. I understand how the school will have to enforce their rule blindly and not take any extenuating circumstances in to consideration, but that does not mean that I have to agree with it.
I am going to have to seriously disagree with Dad OP.... a therapist or spanking for a scratch? I grabbed my daughter's arm as she tripped yesterday and scratched her, should I report myself now? Why does this have to be a big deal?
It sounds to me like the boy did what he was taught was right (seek adult help) and then defend himself (grab her to make her stop) when the adult help never came. Why was it ok that the girls were causing him pain by screaming in his ears, but it is all his fault for defending himself and scratching her? It sounds like the scratch was possibly even an accident when she tried to pull away and he held on?
I personally do not think any punishment is warranted at all and this is a typical "P.R. nightmare" because people overact when it comes to their children.
If this happened to a child in my care I would notify both families and explain that circumstances, then hopefully everyone would use this as a learning experience and provide a positive solution rather than point the finger and punish the "guilty".
Teach the girls to be more aware and compassionate to those around them and teach the boy that standing up for himself is ok, but there will be consequences if he choses violence to do it.
Support and understand each child's decision and help guide them to a better solution and then they can prevent the problem on their own in the future.
I would try to meet with the teachers with an open mind. Sometimes there might be hard feelings toward a more difficult child, but approaching the teacher without blame with help them to remember that each child is special and unique and should be treated as such.
I would let your son know that you support him and his right to defend himself no matter what the school does, but explain the reasons that the school has rules and why they have to enforce them. Use this as a moment to teach him to be responsible for his actions instead of teaching him to be a bully that blames everyone else.
Good Luck - parenting is hard, but it is worth it in the end.