david knows that working with the world's largest land animals is inherently risky. david is warned about one elephant in particular. >> cindy had a lot of crazy behaviors with other keepers in the past. >> a known danger to humans, only keepers who had trained cindy when she arrived from a tacoma, washington, zoo are allowed to get close to the animal. newcomers like david always use the matriarch elephant nita as a shield when they are near her. for two years david keeps his distance from cindy but on that day in january, he . notices she's a little too close for comfort. >> cindy was next to the gate. i needed to get her moved. in the process of moving cindy, i opened the gate. and i should have closed the gate behind me. >> but david doesn't close the gate. a mistake that will almost cost him his life. just moments later he senses he's in trouble. >> i just had a feeling that she