I am really glad I am getting a grasp at this shape-language thing, thank you And you are right, it has its own propulsion, it looks like this right now:
So at the bottom and at the back of the handle there are jets, they can be used as more power for piercing or move around to give more slice power, it is 1 handed sword, but thanks to jets in these places it can generate a slicing power like with 2 hands (leverage with 2 forces in different directions), using a katana for example. There is of course a lot of intertia in the water but it also affects the water creatures so I guess we can call it fine