In the second case there is always a possible course of action.
Why someone is rocky to some fields? You (not you in specific, a general you) got to ask yourself some questions, make some introspective works, and once you understand where the problem is, it’s the moment to target it.
Perhaps someone is insecure about it’s sharpness and therefore there are some blockages for a brain field to be properly assimilated, this someone can work with subconscious limit dissolver 3, and by placing awareness on the underlying blockage, attempt it’s dissolution, maybe in combination with alchemical revision of genius as a first thought.
Perhaps it’s a energy blockage problem, it can be solved with the fields targeting the energy body.
Over sensibility to the brain fields? Starting slow and once someone get used gradually increase the field work load, with a careful eye to overgrowth and overstumulation symptoms.
I think we are of course all different, but each of us has it’s own personal solution, that needs to be discovered.