Well the first thing I noticed is that this technique is a double edged sword; "the user will be knocked back" this immediately caught my attention, that statement gives me an advantage and a disadvantage. The advantage being decided into two parts:
1) When I hit the opponent I will be sent back, this will allow me to use techniques that can be dangerous to myself if I am close to the opponent, per example a earthen pillar, but the recoil isn't that great, it will knock me back 3 meters tops, so I must use this wisely.
2) Well if I had prepared this technique, and I am dashing towards the opponent and they use a projectile based technique, I can slam this on the ground thus sending me away from the proojectile, the 2-3 meters bit mentioned above applies here as well.
Now the disadvantage is situational, but if I used it in direct contact with the opponent, the recoil will send me back a few meters, and depending in how I delivered the attack I might be airborne, this will prevent me from using most earth based technqiues, and some other techniques that require contact with the ground.
"High Pressured Orb"
This means that I can use the technique to defend against incoming projectiles, also since it is pressurized and it fits in the palm of the user, it can go undetected.
The obvious disadvantages are the range and rank. The techniques rank is low, so the ways to defend against it are many, but an advantage rises from this, the opponent would most likely underestimate the technique so it can be exploited. As for the range, it is short ranged, and getting into short range with most role-players is a no go, so I find it hard to use this technique.
In order to perform the technique I exploit the rain previously created by myself, due to the fact that my chakra is in the rain I find it easier to perform the technique. I begin by extending my arm, open my palm, then I begin to gather the rain drops into that said palm, I use shape manipulation in order to form the gathered water into an orb form, the orb is pressurized somewhat similar to the famous rasengan, but minus the spiraling part.