When Allen proposed another offer to the royal court mage, his interest was immediately piqued. Or more like, unless he was an idiot, he would never reject Allen's offer.
Of course, if he instantly accepted Allen's offer would make his loyalty doubtful towards the first prince and therefore, ruin his reputation. So for appearance's sake, he put on an act that made him look as if he was hesitating to accept Allen's offer.
"Are you certain that I will become an 8th Circle Mage? I know that you have heard from my others that it is my lifelong goal."
"The main reason why I supported the first prince was that I saw him as a genius who had a higher chance than me when it came to attaining the 8th Circle Mage existence."