Magical Gesture: Sometimes, especially when the mechanical psychokinesis is invoked; for one thing, it’s useful as a concentration-aid in training. But, like we said back in Invocation, it’s entirely unnecessary for the thing to work (the neuron-implanted nanopicosomes are reading your mind directly, so you think things, and they happen). It’s just done to look cool.
(And, okay, maybe to lure some dumb enemies who haven’t read the book to think that they’re necessary, and that binding them hand and foot is enough to prevent you from crushing their trachea with a thought. Maybe. But it’s still mostly about looking cool.)
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