In doing so, gold-medal favorite Schleu dropped from first position to eventually finish 31st.
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Raisner is believed to have been seen hitting the horse before Schleu entered the showjumping arena, leading to her expulsion from the games, which means she cannot assist during the men's pentathlon competition Saturday.
In a statement, the executive board (EB) of the Union Internationale de Pentathlon Moderne (UIPM) said: "The EB reviewed video footage that showed Ms Raisner appearing to strike the horse Saint Boy, ridden by Annika Schleu, with her fist during the riding discipline of the women's modern pentathlon competition.
"Her actions were deemed to be in violation of the UIPM competition rules, which are applied to all recognized modern pentathlon competitions including the Olympic Games.
Uncooperative horses cause chaos
To ensure fairness during the modern pentathlon, competitors aren't allowed to bring their own horses - they must ride a horse randomly assigned to them 20 minutes before they compete.
One athlete, Italy's Elena Micheli, was thrown twice from her mount Cristbal 21, which at one point ran straight through a fence without stopping.
In total, six competitors in the women's pentathlon scored a zero in the horseriding part of the event, leading many in the sport to complain.
Speaking on Irish TV, former Olympic pentathlete Hugh Forde said: "To be quite frank, it's not good enough.
"Those horses have been tested around those tracks, but that behavior from that animal, you would expect a higher standard at this level," Forde said. "It's too cruel."
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