Performing .
Aoi steps forward a little and stretches his arms , in such way to have his both shoulders out . As he got that specific stance , he noticed the distraction of the clone , and without wasting any second , he started to run , perfectly saving the stance he had gotten . As he got more and more close to the clone , Aoi tilts on his left , to have a better chance to completely knock the clone over with his right shoulder . As he made contact with the clone , he was hit on the stomach area which caused him some pain , and disappeard .
Counter
Alright since this technique needs to be very very close to the enemy , (since you cannot strike with your shoulders if you arent close enough) I doubt anyone is gonna fall for such simple technique . So , you have more than enough time to perform any attack not to let the enemy come to you , be it a simple earth projectile , or a strong Fire attack , as he has his shoulders out , open to any attack .
Adv/Disadv
The first advantage that comes to my mind is when Mandalorian ninjas use this . Since they have armour on their body , their shoulders are 10x stronger than a normal person . So , this matters too . Also , you can encase your shoulder with any earth technique , so it will have better damage . For disadvantages , the fact that you need to get very close is a con . Also if enemy strengthens his body with Doton , you will be the one to get damage .
Opinion
Still a pretty basic , not really interested .