I've posted on other places and we know why it happened, but many might like to see it happen.
The Paper LOC Booster Bruiser with 3/16" G-10 fins was built to be subsonic, and here is what happens when it goes super sonic on the awesome Pro98 N1100 moon burner motor.
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Enjoy the slo-mo at the end....
Art Upton BoosterVision.com