"I was scared for him, I'm not going to lie," Tahj told WRC.
The daredevil was identified as a 15-year-old who was apparently tagged on the social media post by someone.
The teen's mother told WRC that the ride was "light-hearted," WRC reported.
But Metro officials disagree.
In a statement to WJLA and other media outlets, officials said,
“What we all witnessed in the video was not just unsafe, it was reckless. While we are thankful that this person was not injured or killed, those outcomes were very real possibilities.”