full audience and you would hear the crowd clap, it gave you goosebumps. >> but despite the excitement, 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 he 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