They found Mary, as usual, deep in the study of thorough bass and human nature; and had some new extracts to admire, and some new observations of threadbare morality to listen to.
Then, checking that Fred and George were safely immersed in further discussions about the Triwizard Tournament, Harry read out Sirius's letter in a whisper to Ron and Hermione.
When you buckle down to study for a test, finish a homework assignment, or slog your way through a textbook chapter, you're in Robot Mode. You're doing the work.