Sagittarius and Aquarius can enjoy a life with freedom of movement, without having to explain every coming and going. That shared ground is an important basis for the relationship.
Tension appears when Sagittarius tries to set rules that Aquarius considers arbitrary. Aquarius may avoid direct confrontation and keep acting on their own judgment, which in turn may increase Sagittarius’s insistence.
The image of Sagittarius rearing up illustrates that frustration at a direction they cannot manage to impose. Aquarius, however, usually protects their autonomy even if the argument intensifies.
Their agreements need to respect the freedom both value. A rule that only expresses the will of one is unlikely to carry the same meaning as a decision in which both took part.