Serena Williams Says She Chased Down Cellphone Thief

Newly released video appears to show the moment the 21-time Grand Slam champion chased an alleged thief out of a San Francisco restaurant.
2:43 | 11/05/15

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Transcript for Serena Williams Says She Chased Down Cellphone Thief
Serena Williams chasing down that man who tried to steal her cell phone. ABC news has obtained video of the incident and T.J. Holmes got a lot more on this, don't you? You shouldn't steal but let's say you decide it steal and the victim you choose is one of the greatest fiercest athletes the world has ever known who just happens to make her living aggressively swatting forehands and backhands, good luck with that. Now, watch how this plays out. No, it's no the a bird, it's no the a plane. It's not even Superman, it's Serena, super Serena, the 34-year-old chases down a thief who stole her phone. This all started when the 21-time grand slam winner dining at a Chinese restaurant in San Francisco suddenly spots a man coming towards her out of the corner of her eye playing it pretty cool then swipes her phone off the chair next to her. The six time wimbledon winner's self-described superhero sense kicks in. She leaps up, chases after him, surveillance camera catches all the action. The people in the restaurant were shocked. She said she thought that was the best approach so that she could avoid any conflict with him. And I just said, good job. Reporter: Serena confronts the man asking if he mistakenly took the wrong phone. The thief hesitates then sheepishly admits he did because it was, quote, so confusing in the restaurant. Williams recounting the whole incident on Facebook leaving her followers with some advice. Always listen to your superhero inner voice, just because you're a lady, don't be afraid to step up to any challenge and not be a victim but a hero. The superstar even posting this photo of herself wearing that classic "S". I think that she was very brave, she could set like an example for people. Okay, you see the picture there. Great picture, by the way. And she -- these are here superhero very emption did, the speed, the power, the seduction, the sex appeal, the strength, the leadership and yet the calm to weather the storm. Hmm. She laid her resume out. She did lay her resume out there. Very happy everything worked out for her. But what do authorities say you should do. A big but. Generally here she was able to assess the situation and level of danger. They will tell you don't chase after somebody. Don't even fight back if someone snatches something from you. You don't know what they're capable of or if they're even armed. This is a cell phone. If somebody grabs your wallet, a few calls you can cut off the credit card. Somebody grabs your cell phone, you might chase them down the street. You just react. In the end the guy does not get arrested. We don't know what happened to him. He's not too fast so we should be able to catch him. Real soon. Thank you, T.J.

This transcript has been automatically generated and may not be 100% accurate.

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