A Tomales Bay boater died off Dillon Beach on Sunday morning after his leg became entangled in a rope tied to a crab pot that had been thrown into the water. The boat operator told officials that as the pot was thrown into the water and sank, the man, 40-year-old Santa Rosa resident Thong Nguyen, was pulled down with it. Mr. Nguyen, who was not wearing a life jacket, died before officials arrived on the…