IncendiaryGunner
Master
Who says they were originally sent there to disperse the protest? They were requested to be there to see about the removal of the tents and encampments and after that was accomplished they were leaving and the protesters could've gone right on protesting. The order to disperse was only given after the crowd attempted to surround them.
The fact that they were quoting Penal Code 409 indicates that.
Listen to their megaphone warnings again, they spell it out.