Because this is a symbiotic pairing, the two can not venture to far apart from another without feeling mental pain. The actual distance that a person can get depends on how strong the person is mentally, but at most indivisuals can get around three to four hundred kilometers away before either starts to feel pain, the further apart a pair is the more painful it becomes, eventually they can collapse due to the mental strain they have been placed under. It is for this reason why bonded pairs are advised to 'serve' together, either in a military capacity or while in a civilian workplace, such as a starship.