When you are told to leave or move in a high danger situation you comply. If the National Guard was or likely is coming into the area with troops and heavy equipment the cops are usually instructed to clear the area. They were mobilizing last night. It’s that simple.
LOL...loved the way the 3rd Precinct "mobilised" outta their building last night. (Start are the 1:15 mark...)
https://m.youtube.com/watch?time_continue=182&feature=emb_logo&v=v7ov2MLkbl0
All seriousness aside...I'm guessing EVERY SINGLE OFFICER was armed up and ready to defend their station...but were told to stand down and abandon the building.