Holy Molten Caliper Batman! Those pics are might impressive.
So they are saying supposedly the DSC thought that wheel was slipping cuz it may have been rotating slightly faster (underinflated?), so it applied the brake to that rotor to equalize it... Over a distance this overheated the rotor and it 'exploded'.

Holy crap.

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2012 e70 X5 50i MSport "The Boss" black on black *Well Optioned*