South Korean thrown from horse in modern pentathlon

For the equestrian portion of the modern pentathlon, athletes are assigned an "unfamiliar horse" 20 minutes before they're set to compete. Most of the times, this goes well. Other times, you have what happened to South Korea's Woojin Hwang, who was thrown from his unruly mount, Shearwater Oscar, at the beginning of his ride. The trouble started almost immediately. Shearwater Oscar didn't take kindly to a new face, bucking and neighing at the outset. Shearwater Oscar had decided enough was enough and bucked Hwang off the saddle. Fortunately, neither horse nor rider were injured. [Text: Chris Chase, Yahoo! Sports]