Books like One Piece, Volume 16: Carrying On His Will

Avalanche! Luffy and Sanji surf a tree down a mountain on a fast-moving wave of snow and just avoid being buried alive. But then the demented King Wapol suddenly appears and orders Luffy and Sanji's deaths. With no time to lose, Luffy evades their attacks, when out of the blue an unlikely friend comes to his rescue! A friend who was just trying to kill him only hours before!