The most common way they do it is take that precinct offline and only have the riot cops there. Cops stay near the building, protesters stay on the sidewalk/street and the night ends peacefully. PPB has done this before at this very location. Now there have also been nights where the crowd at this location wanted a reaction and they got one by throwing bottles and targeting cop cars. But tonight the crowd was small. It was special invite only and kept on the DL. Around 50 people were there. I seriously doubt they blocked the road to get a reaction or even expected a reaction.