Get counseling while he's being choked? The story isn't "child A chokes child B, child B attacks child A later", it's "child A chokes child B, child B attacks back to defend himself".
But really that is all this is at the moment - a story (or at least as of yesterday when I first read about this. I haven't checked again.). The school can't talk about much because of privacy issues and most of this story is coming from the boy's mother, someone who has an obvious bias. The school itself
needs to look into whether this was a sexual assault/sexual harassment. That doesn't mean the school is saying it is, just that they are considering the possibility like they should. And it could be this even at the age they're at. It's not about whether the attacker gets any pleasure out of the act, but that the victim did not want it. If it's a 7-y/o kid it might mean he's not completely aware of what he's doing, (again, if that is what happened), but that doesn't mean the act can't be a sexual assault.