Subway hero describes showdown with combative passenger

Adrian Kaczmarek is a viral video star for one reason - he stepped up when nobody else would. Earlier this month he was riding the Expo Line train to Culver City.

A combative passenger was storming up and down the train, threatening several other riders. Kacmarek took action before the belligerent man could harm anyone. The 31-year-old fitness enthusiast put the man in a chokehold and kept him in check until police could arrive.

The video of the takedown has been viewed about eight million times.

Adrian stopped by Studio 11 LA to tell his story. He even demonstrated his technique.