I would say that "it" is the object of "think". "a rather clever bit of quick thinking" would be the objective complement.
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park sang joonI'd also like to know if "calculated" is an objective complement of "think.""calculated to hit me in that wonderfully vulnerable place, the ego" modifies "quick thinking".
park sang joon An object-complement of 'think'"think" is a verb. It can only have a verb complement.