German modern pentathlon coach Kim Raisner, who was sent home from the Tokyo Olympics for punching a horse, is stepping down following the Paris Games. “I have resigned. I’m quitting on September 30,” the 51-year-old told reporters on Sunday as this year’s competition and the Paris Olympics wrapped up. She said she is unhappy about certain aspects of the German federation hierarchy. “The way the constellation is, I don’t want that and have drawn a line for myself,” explained Raisner, who was fifth as a competitor in Athens in 2004. “It’s not like my heart isn’t in it. But perhaps there has to …