It would be a long walk from the palace before they'd reach behind the castle where Frederick was waiting for them. It wasn't a comfortable walking distance from Hamon's residence. Therefore, they took Hamon's horse instead. Ara sat comfortably in front of him, while both his arms were below her waist as he held the horse's reins.
Astral was moving in a slow pace, however before they took the horse, Ara had curiously asked, "Hamon why not teleport us both to the place? It will be faster and easier."
But Hamon's reply was, "It is not easy to teleport with another person, I haven't yet mastered that. Normally, it drains half of my energy using that part of my ability, and sometimes it doesn't even work when I need it. Or it might take me to the wrong destination. Let's just take my horse instead for now." He had told her.