Put more effort into it. Thedescription is small, but even so by pointing out uses, and limits. As well a how the shockwave propagates and what motions we perform, etc. Can give for a much larger examination than just two lines. >.> Good, but not enough. Question 1) Eh, people would argue to a yes, but I believe it doesn't require any water present, it simply allows us to split open that water. So i'm my own personal opinion it is usable while on land, just the ground won't rift apart. Fast enough, these travel at high speeds, but that doesn't really matter since they're invisble, even if moving slowly they are nearly impossible to avoid without being aware of them.
(Gyojin Karate: Jodan Bakusho) - Fishman Karate: Exploding Palm
Rank: B
Type: Attack
Range: Short-Mid
Chakra Cost: 25
Damage Points: 50
Description: The user will thrust one palm forward, aiming at a desired body part belonging to the enemy, causing him to be blown back by using the water molecules in the air to release a shock wave. Due to the water molecules being very little in size, only doujutsu is capable of actually seeing the shock wave being created. A regular ninja will think its a simple palm thrust. Once the shock wave connects, it will be difficult for the enemy to breathe normally for one turn, due to the impact. This palm trust is powerful enough propel large summon up to long range.