Police are looking for a man in connection with a possible bias attack on the 7 train.
They say on Sunday afternoon, the man walked up to a 43-year-old man on a Manhattan-bound 7 train, punched the victim twice in the face and then made anti-Mexican remarks.
The attacker then fled the train at the Court Square station.
A witness who intervened says the suspect was sitting near the victim and attacked without warning.
He says the whole incident unfolded in only a few moments.
"It was like two or three rapid punches, quick punches to the face, just suddenly. No words were exchanged, nothing. He was just on him and punching his face," said witness Erik Baard. "It's disturbing but you gotta know this is a person who's emotionally disturbed already so you just have to take it on that level."
Baard said he stepped in and as the train rumbled on tried to talk down the assailant saying ratchet back the violence. And the attacker implied he had a gun.
That's when we're told the attacker went on a hate filled rant about Mexicans and immigrants.
"The most delusional thing he was saying is that this victim had wiped mucus on his sleeve or wiped mucus on him which he had not. It was all in his head," said Baard.
The witness says the victim was stunned and got off the train several stops later.
He says a group of students who were on the train called 9-1-1.
City police describe the suspect as 6 feet tall and 165 pounds.
The 43-year-old victim exited the car with a bruised nose and cut lip, but he refused medical help at the scene.
"When the hate talk was going, he started to well up, he started tear up at that point that's when you know that hate crime is real thing," said Baard.
Anyone with information on the case should contact the Crime Stoppers hotline at 1-800-577-TIPS, or text CRIMES and then enter TIP577, or visit www.nypdcrimestoppers.com.