So the normal thing to expect with a clincher blow-out is for the tire to stay on the rim? In pro-races are clincher tires staying on the rim at high speed when they flat.

I agree a clincher is meant to be a safety tire under conditions where heat could melt your tubular cement.....but during conditions of a flat or blow-out that safety doesn't exist and in fact may be worse than a tubular (tubie will stick to rim despite being flat......as long as glue doesn't melt)