After collecting himself enough in that arduous process of Tom Riddle being pulled from the pages of the diary one piece of a girl at a time, finding the Wraith, going back for the Diadem, and all that, Marvolo had reconnected with the Dementors. His followers were suffering and needed respite so, rational once more, he could really do no less. And Finstarnessi had been welcoming, still the head of the Azkaban clan, and amenable to reducing patrol in that sector until a breakout could be arranged. He’d also been incensed - not at Marvolo, but describing in detail a series of interactions with a known enemy of Marvolo’s.