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MANHATTAN – A pervert allegedly exposed himself to a woman on a subway platform and then pulled out a gun on a man who tried to help her, police said.

NYPD said a 38-year-old woman was on the south bound platform of the N and R subway lines at the 5th Avenue Station about 11:56 p.m. Monday when she heard a hissing noise beside her. When she turned to see what it was, there was a man manipulating his penis outside of his pants, according to cops.

As the culprit began to leave, the victim began to cry, catching the attention of a 41-year-old passerby who asked what was wrong, police said. After she explained what happened, the Good Samaritan took out his cellphone and began to follow the creep while recording until the creep reached the exit of the station and pulled out a black handgun, pointing it to the man and telling him to mind his own business, police said.

The armed suspect then left the station. There were no reports of any injuries.

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