Thousand Tatami (千畳) is a Weight Type magic that is only a support magic and therefore cannot be used to land the final blow. It also takes a considerable amount of time to cast.
Through the process of cutting off the Earth's gravity along the north-south axis, this causes the object to tilt from east to west because of the Earth's revolution. 'Thousand Tatami' is a magic that cuts off the Earth's gravity and isn't something that directly alters the target's Eidos. Thus by the gravity nullifying magic completely, the enemy's defensive magic is ignored around an object as it is activated.