How do the researchers react when Charlie returns? How has his role shifted?

Charlie finds out from these interactions that Nemur does not know much else outside of his limited field of knowledge (and also does not speak many other languages — at least not compared to Charlie, who now speaks languages across continents, and also reads material quickly, so that he is more knowledgeable in Nemur’s field, currently, than the old psychologist himself). Charlie is unimpressed with the research that the other psychologists have been doing, feeling as though they are focusing on narrower and narrower subjects.