The Catholic Occultist

If it's a form of communication, I guess it could be—but likely the manipulator has "seeded" the victim with thought patterns, or is aware of existing ones in the victim, and then "activates" those thought patterns to try to produce the desired result. Thus, any type of will training could in principle break the bonds between the mage and the subject, even if it merely allows the subject to become aware of what the mage is trying to achieve.