So theres a job opening?
I have seen people in terrible states both flailing around and taking it all in their stride. Those flailing around you can get no sense from but those who are calm tend to say or feel whats done is done theres fuck all that can change it so how is the best way to deal with it.
Shock certainly can affect people in different ways but not everyone goes into it. I went to deal with a man who's leg had been blown off below the knee in an RPG attack on his vehicle and when I opened the door he sat there calmly and said "I'm fine mate, but I think the Boss needs help....and close the fucking door its armoured and they are still fucking shooting at us". I was oblivious to the rifle fire but later when I saw that side of the vehicle it was peppered with 7.62 and the front wheel and half the engine was destroyed by the RPG hit.
The Boss was also calm but in a different way, he was distracted and I had to force him to concentrate despite their being no evidence of a wound we both knew he was dieing. Turned out a large piece of the bone from the drivers lower leg had entered the armpit area and sliced through his lung and knicked the main artery going to the heart and he was bleeding out internally....it was sad to see a young healthy and well liked man go like that.
U write very well. It might help deal with these memories if u could write it all down & get it published. If u haven't thought about it, maybe u should.