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The frantic caught-on-camera attack unfolded on the southbound A and C tracks at Broadway Junction in East New York around 9:45 p.m. Wednesday, according to police and security footage.

A 52-year-old man walks past a suspect standing by a shopping cart who began to argue with him for an unknown reason, according to the video, released Saturday by the NYPD.

The suspect — brandishing a knife and wearing a black Nike sweatshirt — continues to exchange words with the other man, who eventually turns to confront him, the video shows.

The knife-wielding man then jabs at his adversary, who deflects the weapon and swings at him with what appears to be a jacket, the footage shows.