If they don't restart his heart in a minute, even if they manage to bring him back to life a couple minutes later, he'll be in vegative state. Of course, this is all speculation at this point.
Trauma codes transported by helicopter have a less than 1 percent survival rate in the US. There has been some talk of changing the protocol to not fly a trauma patient without a pulse due to the risks to the air crew. It’s a higher chance of the helicopter crashing than the odds of the patient making it out of the hospital.