Just for the record concerning Hamblin's condition. It is pretty ominous having to perform CPR period. Statistics bear this out concerning CPR.
Defibrillators are designed to correct a non-perfusing cardiac rhythms only (Ventricular Fibrillation and Ventricular Tachycardia) . . . they don't "jumpstart" the heart. To be sure there is one more shockable rhythm but not relatable to CPR.
He may very well be able to breathe on his on as ventilators are used in cases of cardiac arrest as a "support device" to remove one of the arrest variables. There is the chance brain anoxia affected his respiratory drive center in the brain.
The biggest risk other than having a strong enough self sustaining cardiac output is did his brain lose oxygen flow thru loss of cardiac flow. CPR, at best, delivers only 25% of resting cardiac output so anoxic brain tissue is a huge concern. So loss of oxygen flow leads to brain injury from cellular death/tissue death from lack of oxygen. This is very common post cardiac arrest.
Commotio Cordis results from a blow to the chest and not necessarily a hard blow but one that happens at just the right nano-moment in the cardiac cycle and results in the heart being thrown into Vfib. This is a possible cause.
All of this to say Hamlin's condition is dire, just as dire as the reports. When we say we need to pray for him we need to really PRAY for him . . . out loud and on purpose. This is the one thing we can all do and it can affect his outcome.