A Good Samaritan stepped in and forced a man off a train after he punched a woman in the face because she said he was "manspreading".
Sam Saia, 37, said she had politely asked the man to move his legs while she was sitting on the train when he erupted into a violent rage and began swearing at her, threatening her and punched her in the mouth.
Thankfully, a fellow passenger intervened and grabbed the attacker, forcing him off at the next stop.
But Saia says she lives in fear of seeing the suspect again. He has not yet been arrested.
"That b*****d is still out there," she told the New York Post after her commute home.
"I'm afraid he might retaliate. But I'm not going to back down."
Brooklyn commuter Victor Conde, the brave passenger who rescued Saia, said he had intervened when he saw her in trouble.
"He was definitely not all there," the 29-year-old added.
Video showed him shouting at the abuser: "Get the f*** off the train. Get off the train bro, you just f***ing hit a lady."
The good Samaritan is seen restraining the man and warning him that he better get off, the MailOnline reported.
He said: "You hit her in the face. She's bleeding. Look at her mouth. Just get off at the next stop."
The attack began about 7.45am on Thursday when Saia said she asked the man sitting next to her if he could give her a little more room.
He ranted: "B****, you ain't nothing! I've raped white b*****s like you. You ain't nothing, you f***ing b****!" the man yelled, according to Saia.
After Conde stepped in, the "manspreader" tried to backtrack and apologise but no one on the train was having it.
It is assumed that he got off.
Speaking to Daily News, Saia said: "This took me by surprise. It's just a matter of safety. I want my neighborhood to be safe. I don't want this to happen to other women or men."
She added that she couldn't understand "how you could do that to somebody".
The video was posted on social media by fellow passenger Anthony Macca.
Macca told Daily News that he did not witness Saia get hit by the "manspreader" but had heard the argument break out and started filming shortly after.