YouTuber EITANNOYZE sets the scene:

Heading uptown on the 6 train, this woman sits down next to me. Then all of a sudden she jumps up and starts wailing this guy in the face.

But just before the altercation escalates to an all-out brawl, in steps a lone vigilante armed with nothing but a pile of Pringles strategically positioned atop a bag of white popcorn.

For once, a hero Gotham both needs and deserves.