Turns out the guy who was assaulted was an army vet. Only in New York.A representative for TIMES UP! tells us that the cyclist in this video was arrested, held for 26 hours, and charged with attempted assault and resisting arrest.
Keith Olbermann explains the story: http://www.youtube.com/watch?v=IsJstdZEJh0
Info on Critical Mass: http://en.wikipedia.org/wiki/Critical_Mass