Seeing the beautiful girl blocking the way, Richard was slightly startled and quickly associated her with some relevant matters.
First, the beautiful girl looked very nervous, which likely meant she was new to the job and didn't have much experience before.
Second, even though the beautiful girl saw Prince Gro behind him, she still obstructed the way, indicating she didn't recognize Prince Gro and wasn't dispatched by the royal family of the Jade Kingdom; she might have been someone "Lord Warner" had found on his own.
Third, logically speaking, "Lord Hua'er," if he wanted someone to take care of his daily life, having a few beautiful maids would be understandable, but replacing all guards with young girls was a bit too much—seems like this "Lord Hua'er" is no ordinary person.
Tsk, tsk.