User blog comment:ShinShinTo/What Fights would you like to see during the various arcs?/@comment-7418318-20170607122902/@comment-7418318-20170608060721

Sure Gemeni was able to force Sagitarius to shoot against his will, but only in the first surprise attack. When Gemeni ordered Sagitarius to shoot again, he managed to resist that order, though in the same fight we saw far better examples of Spirits resisting the orders of their owners.

Gemeni themselves resisted Angels command to kill Lucy as well as Caelum who guided that final shot around Lucy. Loke in a way also refused Lucy's order... though she wasn't particularly forceful in her attempt to send him back. Then there's of course Aquarius, who pretty much always does whatever she feels like doing regardless of Lucy's orders.