‘This is not coming from tactics.’ Her voice sharpened. ‘It’s coming from grief.’ He couldn’t turn around. He didn’t want her to see his expression. ‘You said yourself you wanted this place to burn.’ ‘But even more,’ said Victoire, placing a hand on his shoulder, ‘I want us to survive.’
As much as I'm finding this whole thing cathartic, it's so heartbreaking to watch Robin crumbling under the weight of his grief and betrayal. He's completely lost his faith in people, and at this point, I don't even think he's really fighting to stop the war. He's on a self-loathing suicide mission meant to punish those who hurt him, and stopping the war is just a happy coincidence

