Participants in the Occupy Wall Street demonstrations feared getting pushed out of their encampment in a lower Manhattan semi-private park today, but as word came down that about 2,000 people there this morning would not be evicted or asked to leave for a cleaning, they were emboldened enough to push the demonstrations out of Zuccotti Park themselves and onto the place that symbolizes their frustration: Wall Street.

A crowd of at least 500 people took a circuitous route through the financial district at about 8 a.m. this morning, then they amassed on the street like never before. And they faced little police resistance–there were about 20 arrests with only shades of the aggressive treatment documented in the past (the exception being one astonishing display in which one person was apparently punched in the face by a cop; in another, well, demonstrative display by all involved, a National Legal Guild legal observer’s leg may have been run over by a police scooter).

The NYPD is nothing if not efficient when it comes to corralling protestors, however (see: the 2004 Republican National Convention, under the same mayor). Did an order come down from management to go easier this time? Or, like the protestors they have been virtually living with for weeks, did the police self-organize a new strategy to deal with a fast-evolving situation? Either way, it’s not likely dumb luck that police didn’t quickly shut today’s rally when it went mobile.

In business, management often strives to empower colleagues to take initiative. But at Occupy Wall Street, colleagues without management empowered themselves and succeeded, at least on a logistical level today. The still not massive Wall Street movement continues to show an activist tenacity and a kind of endurance not usually associated the members of the Millennial generation in heavy attendance here. It’s an unusual, unexpected kind of protest that formed a group before it formed an agenda, rather than using the agenda–which, let’s face it, is a bit mind-numbing (corporate malfeasance, anyone?)–to form the group. The oxymoronic nature of Occupy Wall Street could only come from anarchist organizers.

The trigger for today’s events in Manhattan was a plan by the City and owner Brookfield Office Properties to tidy up Zuccotti Park, which the movement calls home. To the protestors, that sounded like a pretext for “eviction.” And they had reason to fear. It was the tactic that the City used to break up the much-smaller June “Bloombergville” encampment protesting city budget cuts–the experience that brought together the core organizers of the unorganized movement.