I don't think that needs to mean they used it before. They could just have knowledge that it does. Maybe it comes with being a Geass giver. I don't exactly think C.C. understands all the knowledge she has during those flashes. What's the point of the whole two planets thing then?
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By the pricking of my thumbs, something wicked this way comes.
"Nearly all men can stand adversity, if you want to test a man's character give him power." - Abraham Lincoln
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