A 15-foot tiger shark attacked one of the nations top amateur surfers in Hawaii this week, tearing off her left arm and a 17-inch-wide chunk of her surfboard in a single bite. My arm was hanging in the water, and it just came and bit me, 13-year-old Bethany Hamilton said. I just held on to my board, and it let go. Bethany paddled toward shore using her remaining arm, and calmly told nearby surfers, I got attacked by a shark. A friends father kept her from bleeding to death by tying a surfboard leash just below her shoulder as a tourniquet. Three days later Bethany vowed to compete again. Im going to get back in the water, she said. I want to keep surfing.