Yes, pretty simple thing here. Disobey a police order to move, you get arrested. Standing there in a recalcitrant position after repeatedly been told to move will require something else to get their attention to move, especially when a situation is already tense to begin with.
WHAT THE FUCK?!?!?! I have repeatly said that Hannah did NOTHING!!!! Besides that doesn't even excuse the police brutality at ALL. if this had been a "just arrest" Nancy would NEVER even have gotten SO pissed that she was planning to head down to NYC that very night from VT. Do you think police brutality is OK?!?!?!