Reality Bending refers to an ability normally associated with Authors. It entails bending reality itself to one's whims. This is what one would normally call 'magic' or superscience, however it is not the case. Reality Bending, unlike magic or science, has no logical explanation (or any explanation at all) to back up it's effect, which also leads to it's downfall. (See Confluence)
It primarily relies on it's user's will and intent.
Science would say that a tornado occurs due to hot and cold winds intermingling in a single location.
Magic would say that a tornado occurs because wind elemental spirits have not been appeased.
Reality Bending bypasses all that and says that a tornado occurs because I said so.