Taiki stays still and steady, knowing that Tidus would be disorientated. He probably would be himself if he had been the one riding. Tidus is injured as well, which was bound to make things harder for him.

Yet he is laughing, Taiki turns his head slightly, though he can't fully see his passenger. "I'm sorry... I didn't know what else to do."

So it had been Tidus' dad? It's hard to think that such a cruel man would have such a good son as Tidus.