I ran a very similar call about 8yrs ago. A 22yoPt's.-father in law was operating a crane to remove 50'concrete plings from a flatbed, Pt was on ground to remove one of the wrapped cables on each end. Somehow the piling swung around after one end was released and pinned the young man between it and the trailer, F-I-L had to get from cab, call us.
We got a quick extrication and swooped/scooped into ambulance. I decompressed both chests w/ flails/stabilized best we could for the four block ride to the hospital. Poor guy died an hour later in the Level 1 trauma bay at Norfolk General.
My heart went out to that family, they seemd so much like my own.
I didn't mean to hijack, it just struck a chord w/ me for some reason. I guess I never talked about it. Anyways, this kinda stuff happens to someone, somewhere, everyday. Every once in a while, it lands in our yard.
I've never been keen on the CISD thing. (Maybe because of the quality of the folks that respond...) I'd rather talk to my peers that have been there, but that's just me.
Good luck and talk to your fellows when it feels right.