Think of having two connected switches, where if you turned one on, the other would turn off. Whatever was being charged before would be relieved of focus, and what was originally a minor spell, suddenly would turn in to a full prep in the next turn. There's two turns in question here, thus two preps are allowed. The process of writing them is practically preparing a preparation. Pre-prep.

Perhaps you don't realize how difficult/disadvantaged this situation still could be for me? See, Myron has to half-prep absolutely every single spell he has, before possibly putting them to use later. Corban can mature a prep in one turn using his brain waves. If Myron hadn't prep/prepared a spell prior, he wouldn't skillfully be able to use it against not only other preps, but even against quick-cast abilities that are weaker in your T1E.