Huge props to this kid, he's clearly got more stones than I do. My usual reaction to a subway scuffle is one of two things, depending on my proximity to the situation.
1) In cases where I'm right there in the action, my eyes usually go wide and I stare at my feet or directly out the window across from me. I'll steal a glance or two, and maybe, just maybe try and covertly record the happenings on my phone from my coat pocket so I can review the footage later. In no way shape or form have I ever debated breaking one of these things up, just peak for a second or two and then back to the thousand yard stare...that's how you survive these things. The fact that this woman didn't take to whupping on this kid is frankly astounding.
2) If I'm a good distance away I stare, point, and laugh. At that point I'm just another face in the crowd to the two combatants. Why would I break up and entertaining fight on my daily commute while I'm just trying to enjoy my bag of potato chips?
PS: To the Nicaraguan that just got his ass beat, not a good look having to hide behind some honky-stranger. They take away your machismo card 9 times out of 10 for that. I'm not advocating you fight her, I'm just saying that a white knight literally riding to your rescue isn't going to help your cred.
[UPDATE!] Snackman's true identity discovered! His name is Charles Sonder, according to NYU Local, and he was on his way uptown with a friend "to grab some drinks with a couple of girls" when the fight broke out. "I felt the need to stop the fight as soon as I could," he told NYU Local. It seemed that the girl was the first one to make physical contact but that’s no excuse for any man to kick any female. I had to do something. Everyone else was just sitting there watching." Also, the chips in question were Cheddar Pringles and they were on top of a bag of gummi bears, not cheddar popcorn.