NOTE: This looks short when I post it up here, doesn't it? And I guess I'm supposed to say I don't own these characters. Well duh.
"She has to live," he ordered Will.
Even if no one else did. Because a reality without Marian can not exist. Robin has seen that reality, he lived in it for that fight, that fight where everything, everything was the enemy and Marian was dead. He didn't know how long he spent in that world without her—what does time matter when she isn't, just isn't—but it was long enough to make him never, never want to ever even step near that reality, don't look at it, don't think about it, don't even acknowledge that it's out there. Because right now Robin's reality is: "I have Marian." She might be bricked in by the castle walls and the duty she feels she must perform, she might be getting marriage proposals left and right by Gisbourne, she might have spent the last however long criticizing the way he lived his outlaw life, and he might have chosen war over her when he was young, but he was Robin Hood now and he did the impossible and barriers just disappeared in front of him. So he had Marian and she had that ring, their ring, it belonged to both of them and the rest of the world could dissolve away so long as they stayed alive. The rest of the world wasn't going anywhere anytime soon and they wanted it that way, but it strengthened them to know that it could happen. But only if they just stayed alive.