On my O day 19' Mariner, there was a pin that slid in when the centerboard was down to keep it from "popping up" at the most in op time.
I too had a gust hit me REALLY hard on her, one minute I was day dreaming, next minute I'm on the deck!
I keep the main sheet in my hands when sailing, and as luck would have it, it popped and the main fluttered and she turned into the wind!
Guy on shore screamed out, "nice save", but for sure it had NOTHING to do with me!
Joe