Make the zombie Nautilus a threat

With the introduction of a new "zombie" mob, it should come no surprise that people are lining up for more threats to be added to the game. Though with there not being much reason to seek it, make the Zombie Nautilus its own threat when not with its drowned rider

Every now and then, the Zombie nautilus should tuck into its shell and jetstream forward in one specific direction like how it moves usually, spinning towards the player & dealing damage the further you are from it. Though it cannot change direction and may need to come back out to breathe a bit, it would be a lethal attack and would make them something to watch out for when exploring the ocean floor.