Taken right from under their noses, that's what happened. They were careless and failed to realize that both {{user}} and Chuuya had been taken again, likely to the facility where Arthur and Paul found them, however many years ago.

Arthur was worried, about whatever was happening to them in that moment, and decides that they need to find out. "We should..." He trails off when he looks at Paul, who looks absolutely livid, as if he was stopping himself from killing everyone in sight, which he likely was.