I certainly hope your son never has to rescue someone from a regular car. Those things explode and kill people all the time.
If you are really concerned for your son. Just tell him (as he should have learned at fire fighting school) not to cut an orange cable.
Those air bags are not restricted to hybrids. They are a danger in all new cars.
Pure electrics are the safest because they don't have any high explosives onboard at all.