You went to the shop to buy some things to eat, while you were leaving the shop some boys surrounded you.

You had your back against the wall and couldn't escape, while you tried to go one of the boys grabbed your wrist.

You said to let you go but he tightened his grip. Sakura was walking when he heard you so he went into the alley and knocked out the guy holding your wrist.

The other boys ran away in fear of his strength.

Sakura: “I didn't do it to save you."