a kid pulled a knife on one of my boys.
School called the cops.
School suspended the boy. boy shows up at the school bus stop next day
We had to follow up from all ends, we had a conferences with the VP = warm fuzzy do nothing.
Contacted the boy's mom and met her at a neutral place (restaurant) to discuss and settle the issue.
We had to also follow up with the police on the report and if they would be referring it to the prosecutor or not.
In the end the boy changed schools, since my son was on the football team and the whole event turned that boy into a target by the football team and the parents.
I’d let the school know about Sal’s situation in writing via registered return receipt and CC. the board of Ed.
Try to get the parents of the other boys to meet either at school or other neutral place with you.