The first prep was still being readied, and in terms of how runelore works, unless you properly disrupted it, I don't see a reason why it couldn't be postponed. This agreement would assume I'm only capable of maturing 1 prep every 2 turns, and I'd rather burn a hundred copies of the T1EA handbook than agree to that. The first prep would obviously take an entire turn to properly use, if returned to, otherwise it may then classify as a minor spell if it wasn't trashed entirely.