The segmented unit is navigating its territory's patrol path. If the unit is not assigned to a territory, then it is patrolling around the position it was created.
The segmented unit is investigating a location where it detected a disturbance.
The segmented unit is attacking an entity that is trespassing on its territory, but the segmented unit is not using its full strength.
The segmented unit is angry because it was attacked and is aggressively attacking an entity with its full strength.
The segmented unit is angry because it was attacked but it does not have a valid attack target, so it is wandering around trying to find a valid attack target.