On a downtown-bound Q train, a man approached a woman and grabbed her by the breast, before running away in an unknown ...

The 17-year-old victim was arguing with an 18-year-old adversary in the 96th St. station just after 3:25 p.m., cops said.

Police say the victim, a 17-year-old boy, was slashed in the left side of his face after getting into a dispute while standing on the southbound platform of the Q train at the 96th Street station.