I'm sick of this idea that decent people have to continue to put up with this kind of bullshit. She's SMILING while she's doing it. She's enjoying acting like that. It's sick, and it goes right back to her parents allowing her to grow up like that, and society for continuing to allow it.
He shouldn't have stopped. Once she hit him, it's assault. Hit her back and make it worth it.
While we're at it, fuck the media linked to that site. Did you see how they're advertising it? It's not "Brutal brawl started when woman verbally and physically attacks rider on train". Their headline was (paraphrased) "Brutal Brawl starts when man slaps woman".