Crystal said:
The Egg was already taken even before the Generals and Miranda came (Allen and Bookman couldn't stop them). Just that it came back cause of Miranda, but it'll go back to the Earl again once she stops her invocation. So that's why it was ordered to be destroyed in the instant Miranda stops her invocation.
Yeah, it took me awhile to understand that. I don't think they did a good job of explaining it like that.