Police released a video of the moment the suspect and three other men contacted as they walked down the stairs.
It happened Sunday at West 4th Street-Washington Square Subway Station.
During the dispute, the 28-year-old victim threw the can, and the suspect took out a large knife and hit the victim on the left arm.
The attacker fled north of train A or C.
The victim was treated at the scene.
Anyone with information about the incident is asked to call the New York City Police Crime Hotline at 1-800-577-TIPS (8477) or in Spanish 1-888-57-PISTA (74782).
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