How is a Buddha able to do things beyond the laws of cause-and-effect?

A Buddha/Bodhisattva is one who has Awakened and is free from some basic laws of the universe such as karma, reincarnation, the fetters, and various other afflictions. *In the sutras, such as the Surangama Sutra and Diamond Sutra, such Ones are also able to manifest many other effects -- well beyond **beyond cause-and-effect**, able to shape shift, squeeze thousands of beings into a small house, etc.* This is understandable considering that a One is already beyond cause-and-effect and thus would be able to manifest such things skillfully and according to needs. **So my question is... how is this possible?** According to my teacher, it is the transformation of the aggregates including form and volition... it is still within realm of cause-and-effect... a Buddha is not free from *all* laws of cause-and-effect. I'd like to know what others know about this rather unimportant topic.