Nothing has changed. When I was in junior high (then 7th, 8th, and 9th grade, the grade I was in), totally unprovoked, I was hit in the back of the head hard by a deliberately thrown softball (which are not soft). When I confronted the thrower I was immediately hit in the face. I could have, and perhaps should have, retaliated but I chose to tell the teacher (coach). He asked: "You weren't hurt were you?" And he did absolutely nothing about it.
“…Nothing has changed…”
I also as well, along with everyone else had such things happen, and remember it well, the problem is limiting direct retaliation allows the bullying to continue…
Since Government Education has taken it upon themselves to be the arbiter through their many fraudulent programs to decide what is and is not something to be acted upon. Considering several points, this child is disabled, they are in charge of the child’s welfare, they have video recorders on the bus; the father did what Government Education (aka school system) refused to do…when it is you and your kids I could only venture to guess it seems to be more important; although, for some reason Government Education does not comprehend this.