Quiet
Conflict in blue water is made quiet by the muffling power of water. Under this blue water is a great conflict between two sea monsters, but on the surface it appears peaceful and quiet as the water prevents sound from rising above the surface.
Imagine watching this conflict from above the blue water on a boat. You can kind of see the action, but you can't hear a thing.
せい
しず
None
As you watch below the quiet water, every once in a while a saber (せい) breaches the surface and quietly slices back down.
Sabers are sharp, curved, and totally quiet. Great for underwater blue conflicts, and sneaky assassinations.