Which metaphors does Holmes use to describe his correspondent to Mr. Watson? What do u think he meant?

His quotations were: My correspondent is Jackal. The lion is Professor Moriarity.Although professor Moriarity is a criminal but whatever crime he is doing is openly committed. He did not hide his crimes from anyone, while on the other hand holmes correspondent is indulge in criminal acts but, he did those acts in a hidden way so holmes considered his correspondent Jackal and professor Moriarity as a lion

Yes