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elmo said...
As soon as you feel the fin let go dig your heels in and lift your toes to stop the leeward rail digging and spitting you of.
After that try to pull your heals back under you, generally ends up being a chin-up under the boom.
Agree with the first part, I then drop my bum into the water and use that as a brake, come to a complete stop, then start again.
If you're spinning out downwind at speed, for no apparent reason, the front of your fin may be too thick.