[watching each other's backs is one of those things they just do, they don't talk about it and they don't plan for it. Zoro is content with the battle plan, despite his crack earlier about backstabbing, and focuses on sending 108-Pound Cannons and other flying slashes down the narrow corridor to clear their path. He may be able to sense Sanji behind him, but he'll never see their split-up coming]
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