There are references to people sometimes losing their "mixed" nature and ending up pure-soul, pure-spirit, or pure-essence. (e.g. in MOLAD, it says that bathing in the Stream's headwaters gradually turns you into pure essence, and thus the Stream has no healing quality to people who're already pure-soul or pure-spirit. Unless it's the Creek--I can never remember which is which.)
I could well believe that learning the Secret of your cult has a similar locking-in effect. And if learning Barntar's Secret makes me purely Soul, then it makes sense that I'd be *unable* to break concentration--I no longer have the metaphysical machinery to make use of spells or charms.
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