Neji: The border canyon of the Land of Bears is eternally filled with poison gas. The fog acts as a barrier against foreign invaders
Tenten: Whoa, so this was the danger you warned us about, huh?
Lee: You should be grateful, Naruto. It looks like Sumaru truly saved your life. It is the beginning of a beautiful friendship between Leaf and Star.
Naruto: Whatever, I didn't need his help.
Sumaru: I didn't have to help you, you know. I could have just stood there watching as you perished.