Thank you for sharing this. Makes me wonder what "the event" was. But that's for you to tell or not tell, as you deem appropriate. At any rate, your statement above makes me wonder whether AS and many other conditions/situations make people more susceptible to trauma or more fragile or something. Does that make sense?
Very possible. AS can aggravate it, no doubt about that.
Let's say hypothetically, there's a kid getting bullied on the playground by most of the kids. His sensory issues makes getting beat even more painful for him than normal kids getting beat, so his bullies and their supporters say he's weak and pathetic for saying it hurt so much, and not only use whatever dumb reason they're attacking him as an excuse to pound him they then also use his sensitivities as further justification to "make him stronger" (or kill him, I never rule out among humans the old animal instinct to cull the herd so the breed stays strong), and generally tell him not only is it supposed to hurt, he's supposed to enjoy it because he deserves it, and it's the only way he'll become a better person. And then the rest of the playground says it's wrong and pushes for him to defend himself. And since adults are idiots, the teachers turn a blind eye to the bullying because "boys will be boys" and their behavior is deemed social acceptable, and if he fights back then the whole lot of them get heavily punished for fighting and the bullies will target him even more harshly in the future. Now let's say he also had a typical sibling who often fought with him as children, so he already had a greater dislike for getting his butt kicked in the first place, even though in that case it doesn't bother him as bad because he does have legal grounds to call them out on it and get some help if he so chooses.
Because he's more physically sensitive than others, it hurts more, and that's the main AS component. Because it is a prolonged problem he already has a history with, he can't just walk it off like when he runs into a tree or something even though that hurts a lot too. Because there is a verbal component from both halves of the playground and the teachers, he has echoes or strong flashbacks of the two major opinions playing in his head over and over as the two factions argue with each other that makes his gut wrench as it is no longer a simple case of him not liking it, it now has greater moral and social implications, so he has the pressure to stand his ground and withstand the dissatisfaction he will invariably trigger from those of the opposing viewpoint he picks. And then there is the problem with shoddy authority picking the wrong side because his situation is in the minority and they'd rather side with the majority. And when those compounding flashbacks and dilemmas hit him in full force he huddles in a corner because there are so many overwhelmingly strong emotions both in himself and being forced on him by all the people he's dealt with on the subject from his sibling to the bullies to the teachers to the rest of the playground, and the only thing holding him together is the desire to implode and explode cancelling each other out and putting equal pressure on his emotions and holding them in place. Perhaps as an autistic person he misunderstood something in there, but some messages are pretty hard to miss when told quite bluntly "it's supposed to hurt and you're supposed to like it" from one party and the other says "it's your duty to let it happen to you".
And that's pretty much what I went through and still go through on occasion when my bad memories hit, but on a different subject. AS sensory issues and AS vivid memories coupled with a bad situation people find socially acceptable based on who who's doing it to you regardless of any research saying otherwise and being told you should like it because everybody says you should. Bah.