I have never heard of anyone breaking their leg either. However I have witnessed first hand, a client on my boat, sprain their ankle. This particular person had their foot wedged in there, too deep I'm sure, and we hit a rock. They fell backwards, and instead of falling out their ankle stayed put. I know other guides who have been through this, twisted and sprained ankles. I've heard the horror stories of the entrapment possibility but have never witnessed it. I guess you could relate this to the face cage, some like it and some hate it.