In Chapter 7, Amir and Hassan win the kite-flying tournament as Amir cuts down the last remaining opponent. Both Amir and Hassan are elated after Amir cuts down the final kite and Hassan immediately chases after it. After Hassan runs to capture the blue kite, Amir wraps up the loose strings on his kite and gives it to Ali, who is standing on the other side of the gate to Baba's home. Instead of speaking to his father and waiting for Hassan to return with the blue kite, Amir decides to chase after him because he wants to be the person who presents the opponent's kite to his father.
After searching the city for Hassan, Amir finally sees him surrounded by Assef and his followers in the back of a dead-end alley. Amir then watches as Assef proceeds to rape Hassan while his friends hold Hassan down. Instead of intervening, Amir watches from behind a wall before he runs away. Amir more than likely ran away because he feared that Assef and his friends would also harm him if he attempted to stop them. Amir's feelings of jealousy might have also played a role in his decision not to intervene and flee the scene. Amir's feelings of guilt might have also influenced his decision to run away. He did not want Hassan to know that he watched him get raped and idly stood by without intervening.