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I have taken care of patients who’ve experienced this. Looking at the replay it looked to me like he came down at full speed on the other players helmet and that may have been the cause (the hard helmet striking his chest with velocity). Other possibilities but just my guess. Basically causes asystole - no organized electrical activity and no contraction/pumping of the heart. It basically is immediate pulselessness. The AED is useless because it is ineffective when someone is in asystole. Quick CPR and IV drugs to stimulate cardiac conduction is all you can do. If you survive it, it’s all about how long you were down, how effective the CPR was, and letting the heart hopefully recover from cardiogenic shock while providing as much respiratory and cardiac support as possible.