Shortly after 4 p.m., Boston and Cambridge firefighters and Boston and State police began rushing to the Mass. Ave. Bridge on a report of a sailboat tipping over in the wind and dumping somebody in the water. Just as firefighters were about to begin their "tech rescue," however, the person managed to get back in the boat and make his way to shore on the Cambridge side - where he was met by troopers and Cambridge firefighters. He declined medical attention.