In an ideal situation the driver and passenger cabin should be rigid and the strongest part of the car. Drag racing seems to have this figured out as they have the strongest cocoon for the driver.
Since it is the strongest part, in a most serious accident, it should be the only whole part left over. Parts leaving the car, I do believe disapate energy and lessen the g forces on the occupants. In drag racing the engine compartment by design separates from the driver cocoon on purpose as the engine and fuel is dangerous to the driver.
I would suspect the Enzo is designed indirectly to separate in this way. It is primarily the result of the cabin part of the car being stronger than the other parts. The designers had a choice to make the connection between the cabin and the engine as strong, but elected to not add this extra weight to keep something potentially dangerous attached to a car obviously in serious trouble.
That my view and this is as ususal out my ass.
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