Petra Biehle And Horse Hit: Full

First, I need to confirm the basics. When did this happen? I think it was in 2011, during the World Equestrian Games in Lexington, Kentucky. The horse was named "Hit", which I should check if that's correct or if there's another name. Then, the specifics of the accident: during a team event competition, Petra was knocked off by a horse's strike, leading to fatal injuries. I should verify the exact nature of her injuries and the medical response. Also, how did the equestrian community respond? There might have been changes in safety protocols afterward.