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I could be wrong, but I believe the carbon fibre tub is designed to split like that.... passenger compartment is well protected and remains entirely intact.
I think the rear tube structure carrying the engine basically tore out at it's bolts but the tub remained intact. It's a carbon fibre tub with front and rear bolt on strutures isn't it. That Mazda driver's gonna have some insurance premium increase. Number one cause of accidents is failing to yield.