Considering how almost all manipulation water techniques require water source, this one is a basic technique that falls under this category. The user manipulates the water around and creates four sharks. Well, this technique can be easily evaded by escaping upwards or have an omnidirectional shiled of earth that renders the sharks useless. The range is kind of unamusing. Although, if hit, this technique can crush enemy's bones and leave him in a vulnerable postion, which can benefit you in many ways.
This technique is also a good one to use, which has all the three usages. Though, I'd usually use this technique in defenisve formation, as it can block every fire technique. The force of the vortex can be enough to render an opponent unconscious. Since it requires water source, you can create the vortex wherever you could make use of it, you can even form the vortex beneath enemy's legs, to scare him off and also harm him severely due to the spinning movement of the vortex. Because this technique is of a huge scale, it blocks your sight of your enemy and vice versa. Although this was unnecessary to say, as it is a common disadvantage/advantage.
This technique is also a good one to use, which has all the three usages. Though, I'd usually use this technique in defenisve formation, as it can block every fire technique. The force of the vortex can be enough to render an opponent unconscious. Since it requires water source, you can create the vortex wherever you could make use of it, you can even form the vortex beneath enemy's legs, to scare him off and also harm him severely due to the spinning movement of the vortex. Because this technique is of a huge scale, it blocks your sight of your enemy and vice versa. Although this was unnecessary to say, as it is a common disadvantage/advantage.