Hallucination:An experience involving the perception of something not present.
Hypnosis:The induction of a state of consciousness in which a person apparently loses the power of voluntary action and is highly responsive to suggestibility and direction.
I agree that the senses can be tricked. But this is obviousely not what is being discussed here.
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As the DB explains their minds are paralysed which means it affects the mind in some way though it is not controlled fully. It is obviously not a simple illusion where senses are tricked.