Nobody ever asks the angels what they are doing. Maybe they aren’t really dancing, but doing chi gong exercises.
Like the face of God perhaps, Moses was only allowed to see where it has been, or the hinder parts of God, but never where it was facing...the angels have always moved onto another pin when we get around to examining the previous pin.
We know where an angel or even the spirit of God has truly been because the people involved were left in the joyous expectancy of hope, were spiritually and physically refreshed, or in the case of Mary and Elizabeth...soon to be pregnant with the two most important people of History!