I HIGHLY doubt all that damaged was caused in that one moment; the amount of stress needed to rip sheet metal to that magnitude in one instant is absurdly immense, far more than even the vaulted awesomeness of a BMW can generate (even without the SIR ). I'm much more likely to believe that this damage had been propagating for quite some time, with a small crack fatiguing and growing to the point where a minor incident as you describe finally allowed it to break across a critical area.
Sounds more like lack of adequate on-going inspection of a critical safety area, to me.
GA
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