When we lack soul energy there is a kind of emptiness, a gap, in our (energy-) body. However, in the universe there no empty spaces but only flowing energy, and thus the empty space is filled pretty quickly with other energy. Are we the host of such spiritual intruders it is often expressed in suffering or diseases, e.g. uncontrollable anger, addictive behaviour, chronic depression, cancer.
Also houses and places can be blocked in their energy field.
By means of extractions these foreign energies are being removed and given back to nature, so that it results in a harmonisation of the energy body and field.