Just calling out the goof section. After kenshin got the cross shaped scar he didn't immediately vow not to kill. He fought and killed in the frontlines instead of hiding in the shadows as a hitokiri. After they won the war it is only then that kenshin vowed not to kill. The opening scene is after he got the scar but it is still during the war.
Review of Rurouni Kenshin: The Movie
