Why do relatives die previously they are rescued during accident?

this is related to stress physiology.Why do relatives die previously they are rescued during accident?
shock followed by cardiac arrest or heart failure.
It depends how serious the fluke is. time is critical in a discouraging accident. If they are loosin too much blood, due to an injury they could enjoy brain damage or other internal injuries. Broken bones and severed parts are never a laughing issue. Time is critical if someone is going to survive a servere accident