At that point the good-Samaritan vagrant, who is believed to sleep in nearby Cooper Square, came by and scared off the attacker, sources said. He then ran after the man, pursuing him for several blocks down Second Avenue to East Third Street, where police made the arrest.
The Post reports that the suspect, Casey Holloway, who is also homeless, was charged with sexual abuse and forcible touching. He has nearly two dozen prior arrests.
The identity of the man who broke up the attack was unknown.
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