If the tire went out on you mid-turn, there's really no way of knowing what happened. I hit a shadow-obscured pothole at +30mph, which effectively destroyed the rim, but my tubeless tire didn't so much as burp. I've also had slow leaks bring a tire down below 10psi and ridden it just fine, at least until I could get somewhere to stop and air it up. Even if you burped a bead, it wouldn't lose all of the air all at once. If I were to wildly guess, I'd guess glass cut that was either pre-existing and "popped" in the corner, or glass cut inside the corner itself. It happens.
Some years back, I had a rear tire suddenly go to 0psi during a +20mph right hander, and essentially high-sided the bike. Cracked helmet, wheel destroyed. Absolutely no way to tell post-incident what precipitated it. Maybe the rim failed and took the tire out, maybe the tire failed and took the wheel with it. All I know is one second I was turning, and a second later I was flat on my back in the middle of the street.
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