very sadden to hear about this unfortunate accident.
After reading Rick's details of the events, my very first thought went to " possible laryngo- spasm"...which can lead to another series of cascading events...impaired oxygen exchange ( hypoxia), abnormal acid-base physiology (acidosis), lethal arrythmias...
Some mitigating factors can be the gentleman's physical condition, but this can happen to the most tip-top athelete as well..
This is really tough to talk about, and I mean no disrespect.... about how long before the others arrived to offer assistance? (guideline is about 4 minutes before you have anoxia, brain death)...
My thoughts are along the same line as loco4viento...
ventilation ( and time) is critical
my heart goes out to his family + friends
J
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