Izo
Tranny Chaser
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Laymen cannot make that call, pronouncing death, except in the event of decapitation, mashed skull, decay and the like. What you describe may or may not fall in that category. Laymen must do 30:2, assisted by an AED if possible, until relieved by a healthcare professional. The punch is non-existent in the ERC guidelines. Because it doesn't work, and laymen have no way of knowing whether this is the case or not.Depends on what caused the cardiac arrest. If it was something traumatic like a car accident, stabbing, fell out a window, etc. then they're dead and CPR is useless. If something just caused the heart's electrical system to get screwed up, then their survival chances are extremely high with quick CPR/AED.
If you actually see someone go down you can give them a solid punch right in the sternum and it acts like a mini-aed and can restore their heartbeat.