I think it's more about the world the Da'at would like to create. When I turned completely into crystal, he saw Gai (the almost-nice one) who talked about the memories trapped into crystal etc it this world.
I think that because he saw that he turned blind, allowing him to leave with the memory of Inori beside/inside him.
Don't know if I'm clear (cause it's also a bit messy in my head)...
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