My goodness I don't have words for how hearing about his experience makes me feel, but would you add my 'well done, young man!' to him? Having been through a year or so of depression and self-harming at about his age, I know just how dark that pit gets and how it seems to want to close in on you...
For me, the trigger was also school problems, mostly with teachers, like Suz's daughter experienced---I wasn't the best fit for a traditional schoolroom and they didn't know what to make of me, and fear/uncertainty/insecurity pushes even adults into questionable behaviour. Given that, I can't imagine adding bullying, especially with physical assault, to the mix (though had a good slice of that in the first few years of school, alongside the targetting by assorted teachers, when six---what fun school was...not!).
However, I'm for this very reason so, so glad for him that he's had great authority figures as well as good friends to count on through it. I didn't, not so much. Hence another couple of 'well done, you!' for you as the parents, Shannon, and his counsellor.
One thing to note about coming out from such experiences: It does make you stronger, truly, to survive. Another point to remember: it leaves scars--and just as with surgical scars, they are nothing to be ashamed of; but they do bear watching all your life. I hope this doesn't sound too doom-laden---not my intention at all; but life has a way of throwing up triggers that try to repeat patterns...