[ If Riku had asked that question out of the blue while he wasn't exhausted and coming down from a massively overwhelming Darkness-related experience, Arden would have really snapped back at him. After how much progress he'd thought they made, and for Riku to ask him that... ]
... I thought I told you that already.
[ He tries to keep his voice simply to confusion. Maybe Riku thought before that Arden only explained why he started cooking, not why he kept going with it. That would be a subtle distinction he could understand. As it is he focuses his eyes forward and keeps pace with what Riku's steps appear to be - which are hardly speedy, but he's not standing still either. ]
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... I thought I told you that already.
[ He tries to keep his voice simply to confusion. Maybe Riku thought before that Arden only explained why he started cooking, not why he kept going with it. That would be a subtle distinction he could understand. As it is he focuses his eyes forward and keeps pace with what Riku's steps appear to be - which are hardly speedy, but he's not standing still either. ]