Kanda had already turned into an enemy the moment he betrayed them. His treason to gods falls into deaf ears when he mentions his intentions to kill Metalia, instead focusing still on his head to cut for all he did.

And yet he lowers his sword by Mercury's command. But not his shield nor his caution.

There is still a question lingering on his mind, that his body already spoke volumes on a single matter: Cortana. They had to get her back.