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I noticed that Nunnally looked up, but what I thought wasn't that someone was there. When she looked, she looked directly at the key; at that moment, I knew she had regained her eyesight. She stops and rather slowly looks EXACTLY where the key is. I somehow don't think that when she opened her eyes for Lelouch was her first time opening her eye; it was too effortless. However, I can imagine her being so desperate for the key that she opened her eyes in search of it and that's how she guided her way back to her chair. We have had clues that Nunnally can walk or crawl well for short distances, so I wouldn't be surprised if she was able to get back to her chair with her eyesight. Or it could be that someone is there like that other person said, but that never crossed my mind. If it's someone, who would it be?

I don't think we need any more explanation on Geass, we have everything we need; all those episodes on the Geass was enough. I believe we can expect an extra about it or something.