He keeps up the glaring contest for several minutes, before huffing and turning from them both. If she's going to make this big a deal of it..

He makes to fly up, wings suddenly at his back and intending to fly back inside if he can get free. Eiji and Hina can take care of balancing each other, and he is giving her what she wants right?

Any similarity to a tantrum are the others imagination, and this is just him making a strategic retreat.