I had time to ponder this very question a couple of years ago. I was anchored off an exposed island in Sulu Sea when a thunderstorm came off the mainland with quite a bit of wind and swell. To cut a long story short a 60ft+ steel
dive boat came down past me, maybe 20 ft to one side, dragging it's mooring
My plan was that as soon as I thought his mooring
had caught my anchor
chain, I was going to drop the snubber, cut the bitter end, head
out for the rest of the night and retrieve my anchor
the next day. As it happens, we didn't get tangled.
It was interesting to note that the next morning, the dive boat lifted his mooring with his windlass
, motored to the top of the bay again and dropped it!! I didn't hang around to find out if he drags every night, or only when it's windy.