Did the gust break the painter/bow line, or wasn't it secured by the bow? The others weren't as dramatically effected, perhaps it was the way it was tied up?
Sorry C, no idea.
What's shown in the video happened on Xmas eve in NE Sardinia, pretty far from where we are, and a boating mate forwarded me the video link, which I thought to post here just out of its peculiarity.
But I know nothing else than what you can see....