Head Injury More Condition_symptoms What Type Of A Head Injury Would Be Instantly Fatal?

What type of a head injury would be instantly fatal? - head injury more condition_symptoms

One of my friends just before 10 days died in a car accident. He was ejected from his car and was headed next to a brick water well. Frankly, I do not know whether he died from a head injury and broke his neck. He was pronounced dead at the scene, but I guess I do not suffer and he hoped that his death was instantaneous. I'm not even sure that the wording of the law. Only after a period of certainty and closure, I suppose.