jaime2000 comments on Harry Potter and the Methods of Rationality discussion thread, February 2015, chapters 105-107 - Less Wrong Discussion
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Why are they having a normal conversation and occasionally switching to Parseltongue to confirm the more important bits? Why not conduct the entire conversation in Parseltongue? Seems like the best way to ensure full cooperation leading to superior outcomes for both parties. Harry has already sneaked one lie past Quirrell, and he has no idea how much of what Quirrell said is true outside of the parts he deliberately chose to speak in Parseltongue.
Parseltongue is a low-information-density language - it lacks a lot of technical terms, colloquial phrases, and the like. Communication is much faster in English.
Because EY wants the chapter to be not-annoying to read, might be one good reason.
Quirrell models himself as more intelligent than Harry, and has had far more time to plan, so he expects to win in any even contest. Being able to lie grants both parties great flexibility of options, which he expects to make better use of than Harry.
However, Quirrell seems to dislike lies - half truth, yes, misleading information, yes, but blatant lie is just not in his style. Whether this is an inherent feature of his character or sense of honour, or he wants to keep open the possibility to confirm his words later in Parseltongue if need be, that's an open question.
Inherent feature. We're told this in chapter 51: