What really happened at UC Davis 'Occupy' Protest?

Wondering what really happened when the police pepper sprayed a bunch of students UC Davis on November 18, 2011?
Here is a clip that truly shows the whole story, and not just the shocking parts the media ran with. The real "action" starts about 7 minutes in.

In contrast to what you see here, read how the Huffington Post reported the story-
UC David Pepper Spray Investigation Lead by Groups that Works for Wall Street Firms
UC Davis Police Pepper Spray Seated Students in Occupy Dispute

Who do these kids think they are telling the police what to do and blocking them in like that? They are borderline in holding the police hostage! I think the police had every right to pepper spray the students.