Hahaha, who else already knew that "battle" was just a performance? (cliche?)
From the moment I saw the "Demon King" said "The Time has come" I already knew it.
That it's time for Shiki to be sent off of that place and go to an adventure.
I kind of figured that was the deal and all, but the part about them running out of power wasn't part of my expectations. Just thought they wanted to send him off since he wanted to see new things, but wouldn't have left them without a push.