I had a similar thing on a bus once, all the seats were full so there was a line of people standing down the middle aisle of the bus. There was an old homeless dude on one side and a young woman on the other side, and he was hassling her and kept reaching across the aisle and touching her, which she obviously didn't want. The guy standing up nearest to them kept stopping the guy and sort of swatting his hand away whenever he tried. Then the bus stopped and the guy turned to the guy behind him and was like "This is my stop, you got this?" and then the next guy moved forward and started telling the guy off and swatting his hand away.

After that it just kept moving like a production line of us telling this creeper off and pushing his hand away. It didn't seem to matter if those of us in the line were men or women, he was just really obsessed with this one person. So at least five people in front of me did it, then I did it, then the guy behind me took over when I had to leave. I have no idea how long it went on for lol.