We don't have access to their technology, Roxas. They use machinery to generate the shifts that are set upon the village, and we don't have the insight to how it was created. We also have to keep in mind that inside the barrier, anything we'd try to do wouldn't be as effective.

However... do you remember the missions? One of the rewards is a bracelet that apparently can cancel any shifting effects placed on the user... for one use only. It might be something to look into, should anyone decide to obtain one.