Board Thread:Questions and Answers/@comment-108.205.136.124-20140225234503/@comment-69.120.128.180-20140302062451

Oh man, that'd definitely be interesting; Ryuuko could probably use the scissor blade to actually kill Ragyo and maybe even free her own body from the life fibers, then.

Still, the fact that Ragyo/Nui haven't mentioned (I doubt they haven't noticed) the fact that Nui's eye hasn't regenerated is a bit weird. Either they're trying to keep it under wraps, or, like you said, she's lying about the eye being gone to trick Ryuuko, or something along those lines.