Oh Merlin - what was he meant to do? Was he meant to carry on? Try and defeat Voldemort alone? He found that any determination he’d had to defeat the Dark Lord had fled when Draco had. What did it matter? None of it mattered. Surely, he had done enough? They’d destroyed four of six Horcruxes. Someone else could deal with the ring. And he was sure that Voldemort could be relied upon to deal with him when the time came.