Atlas came out of the forest with Lancaster accompanying him. Lilith and Yovana walked in the back, talking about something that Atlas didn't care for.
The only thing he cared about was Yovana's real identity which she said she was going to tell on the way to the Kingdom of Wolves.
For now, he was immersed in trying to explain his reasoning for not telling Lancaster that he was a Progenitor. For what he needed to do next to keep his promise, he needed the help of Lancaster, and it could only happen if Lancaster trusted him.
Atlas didn't tell Lancaster that his spirit had transmigrated inside the body of Castiel. Instead, he made up another story to justify why he hid his real identity.
"So you lost your memories?" Lancaster asked incredulously.