Following this Dementor incident, all four houses calmed down considerably, clearly needing to expend a great deal of effort to relearn the feeling of casting an Expecto Patronum.
Lord Voldemort, meanwhile, continued his usual leisurely routine of wandering about aimlessly every day.
This year marked the final phase of steady preparation, but Sirius still needed to find an opportunity to clear his name, as doing so would allow them to throw Potter out of their house immediately.
Chapter 136