He said that without much concern, because he knew that Eighth Brother had never been out of the capital before, and he might not be aware of the danger happening outside home. Therefore, his Eighth Brother might get very startled by what was happening. Also, he was a lord who might not stand such misunderstanding.
A lord had a very noble social status in the capital, but here on the water, especially when you could not pull the anchor to any bank, a lord might have the bigger possibility of being caught and killed.
Pirates would always be there, since they were acknowledged to exist by the businessmen and civilians.
The governmental offices never had their hands into such a group, nor were they able to handle such a group either. So what they should do right now was to hide their real social statuses, pay some money and get by.
He talked to his Eighth Brother in this way, because he was worried that his Eighth Brother would make a fuss.