Trance/hypnosis is OK, in terms of it being without conflict. "Concentration" is "NOT OK" because concentration is a FALSE concept, it does not really exist because there is effort in it, so the horizontal conflict (the concentrator trying to be concentrated). What goes by the name of "concentration" is a struggle, although the struggle of "concentration" can maybe change into hypnosis (but those two cannot exist at the same time).

So it can be said that UP/Yoga/Dhjana/Zen is the whole unobstructed movement in and out of hypnosis/trance and what is NOT It is the struggle to get "there" or "somewhere" called concentration, effort, horizontal conflict, goal, purpose, end in view, the idol, desire, fear, etc.

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EDIT: Oh, OK, hypnosis can be physically dangerous! Like in a car crash or a "crime of passion".. So yeah, I guess one better watch out! :)

.. When we DO something (in physical movement and action).

In stillness and silence it's not a problem.

In the case of a movie it's being "lost" in the META Process of the story of the movie and visual/auditory stimuli. Not a problem really..

In the case of a Crime of Passion the Meta Process, acute emotion, activates a highly injurious act.

And in the case of causing a car crash, it's just being "lost" in pure META Process (story/images told produced the brain).