I’ve never been quite able to ascertain what the expected outcome is from all this? Is it a cadet(s) thrown out of the ATC? I will say this and it might not be appreciated, seeking something like that will have the potential to create a whole load of aggro inside and outside the ATC, the latter the ATC can do nothing about.
So there wasn’t an essay or full-blown statement from all concerned written in the camp log, as suggested it would have been little more than a couple of notes to say something happened and it was dealt with.
If it required some degree of medical intervention then there would be more as it could impact participation in other things. Which staff need to know about. Plus potentially ramifications later.
I think also a bit more of a sensible approach would be to say to your child, people say all sorts of things. For their sake you could have spoken to the CI and just asked they keep an eye on things, tell your child what you’ve said and they’d have calmed down.
My brother and I and many of our mates would have been long dead if any of us had carried out “do that again and I’ll kill you”.
If the threat had been attempted that’s a different thing altogether, but it wasn’t and never was going to be, as history shows, given your child is still alive, despite all parties remaining on the camp.