Startling video shows the frantic seconds when a 35-year-old man wandered into a Brooklyn precinct stationhouse and attacked a police officer with a butcher knife.

Officer Venus Pagan, slashed in the face, fell to the ground as he she fought off the suspect, Justin Coleman, 35, who ran off but was chased and shot dead by two other officers, video shows, as he moved toward one of them with the same weapon.

The videos, released last week by the NYPD, include a closed-circuit TV feed from inside the 73rd Precinct stationhouse , in Brownsville, the footage from Pagan’s camera, surveillance video from Saratoga Ave., where Coleman was killed and finally the body-worn footage from one of the cops who shot him, Officer Ernest Joseph.

The body-worn footage does not include sound because the

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