It happens from tiem to time, but it's still not legal to keep. Techincally, it's a snagged fish and must be released. Snagged fish w/o trying to snag occurs every so often regardless, could be a number of reasons why ... most obvious example I can remember was with Parker on the Kasilof ... sitting on jet planers and eggs, rod buckles and we're off to give chase, somehow some way, hook in tail wrist. How? Ya got me! never a hookset, bait not moving at all ... just one of things that happen. Too bad, it was a helluva fish too