Thanks for writing this up in such detail Flyblown, as the outcome of the hunt aside, has provided an excellent thread topic.
I've also seen the immediate drop from shock to the spine followed by recovery several times, and the blue area looks about right and also back from there to the diaphragm, staying just under the spine, while in this strip being in the thinner less vascular edges of the lungs.
Forward and above is through the shoulder blade (perhaps a little tricky to see on the diagram) which will hopefully promote sufficient disintegration on the near side to spread a fair bit of damage around beyond for a quick bleed out.
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