"Atlan hasn't even started yet," Lucius calmly commented. "Though I'm sure that you should've known it..."
"I noticed it last time as well. There are times when you're like a completely different person who doesn't know anything about us. And at other times, you're the same old Castiel who destroys whatever stands in his path. Just what has happened to you ever since you went to sleep?"
Lucius had seen Atlas last time. Atlas had been struggling around that time. Lucius even thought that this guy wasn't Castiel. However, that was also the time where Castiel made an appearance inside Atlas and removed all the suspicions from Lucius that this guy was actually Castiel.
Despite that, it was still quite strange as how he didn't know that Atlan hadn't even started fighting seriously yet.