Worried eyes met shocked eyes, countless unspoken words passing between the sisters in a single glance. "...The Moon Engine..." The ancient device' name left two mouths at once. Celestia leaped from her cushions with a sudden unseemly haste, a single step and a flap of her graceful wings bringing her to her sister's side, "Luna, sister dear, I'll have to entrust you with the courts and the sun for just a little while. I'll be right back but just in case it takes a day, I want you to raise the sun, ok?"