https://www.nbcwashington.com/news/local/northern-virginia/i-can-defend-myself-jogger-takes-down-man-on-electric-bike-who-she-says-groped-her/3424723/

"He smacked me from behind, and I saw him smile, like he’s smiling, and he just took off and I tried to catch him,” she said. “I couldn’t catch him, and then I found a guy in a car and I asked the guy if he could help me chase the guy, and he helped me.”

They followed the man for almost a mile through busy Arlington. 

She finally caught up with him in Rosslyn and physically subdued him with a chokehold at Wilson Boulevard and North Lynn Street until police arrived