The Sandaime Hokage nagged him for a long time, talking about unity and friendship. You two should make a hand seal to reconcile. If not, you two would go to the door of the classroom and stand hand in hand to listen to the class for the whole day.
So he reluctantly went to Uchiha, and as soon as he stretched out his hand, the opponent's muscle memory reflex threw him over his shoulder.
Holy shit.
The moment his face touched the ground, he thought that he had to get a sandbag to practice this move and return it to the Uchiha.
Intention: This is what growing up is like