He laughs. "Ah excellent! Such a good soldier you are, obeying my orders."

She can say it's because he's unimportant, but that just means he has to double down that he's making it an order. Even more since she knows he doesn't really give orders. Especially not to her. But her rebellious nature is no less than his, and that's why he's doing it this way to remind her exactly of that.