Leon made sure Allynna's bedroom shield was safe. No one can enter this room except him. And no one can hear what's going on in this room, only him.
Not long after... he can hear from a distance his father has arrived at his castle. Before leaving Allynna's bedroom, he glanced at her once more, then he magically disappeared from the room.
Without anyone noticing his presence, Leon was already standing near the main entrance. He's standing in the middle. Behind him, the servants are lining up on each side of the gate to welcome his father.