Surprised by the [[demon fox]]'s [[chakra]], [[Sasuke]] asks [[Naruto]] what he is. Naruto responds that he is a friend. Naruto attacks and Sasuke is unable to keep up with his speed. Naruto begins beating sense into him, causing Sasuke to yell that Naruto, never having had a family, can't understand what it's like to lose them. Naruto admits that this is true, but says he had come to think of Sasuke as a brother. Realising that Naruto regards him with a familial bond, Sasuke's [[Sharingan]] fully develops. He puts on his [[Konoha]] [[forehead protector]] and promises to sever their bond so that Naruto will no longer pursue him.