Габитус
Я поискала и нашла: Harry Potter and the Half-Blood Prince, Chapter 2 (Spinner's End)
Снейп оправдывается перед Беллатрисой:

The Dark Lord is satisfied with the information I have passed him on the Order. It led, as perhaps you have guessed, to the recent capture and murder of Emmeline Vance, and it certainly helped dispose of Sirius Black, though I give you full credit for finishing him off.