"Abbey D'Agostino of the United States leaves the track on a wheelchair after twisting her ankle in the 5000-meter semifinal on Tuesday, August 16. D'Agostino and New Zealand's Nikki Hamblin, right, <a href=""http://www.nbcolympics.com/video/us-runner-finishes-race-after-falling-hard"" target=""_blank"">collided during the race</a> but helped each other up and managed to make it to the finish line."
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