"Who was that, Master?"
It was Rosellete asking Ellena. For the reason why she was calling Ellena "Master", isn't it obvious? After a few reminders to Rosellete not to call her 'Master', Ellena could only shake her head in frustration. She eventually surrendered.
Ellena sighed before answering. "It was a messenger from HQ telling me that my fight with Verxal is on the clock."
Since Rosellete doesn't know some details, Ellena started explaining it to her, also to Selena since she's obviously still confused at the moment. Even though Selena already knew some, it still might have been appropriate to explain.
As for Thalia, she's starting to understand everything and it was commendable since she's fast in comprehending things.
"Well, in the adventuring field, I have another identity named Noelle. Also, I am hiding my face, and just for some specific reason, I got the nickname "The Masked Monster"."