Crow (鴉) is Tobimune’s printed swap: trade places with a feather. A faint spirit trace lands on the chosen feather first. External Crow is unofficial: move entities other than Samura and the blade. Chihiro notes Tobimune was forged for support. Crow is the support move that is also an entrance.
Feathers before Owl
Owl makes Japan a room. Suzaku heals, then kills contracts while keeping the man. Crow is how a blind swordsman is already in the hallway. Official chapters: VIZ / MANGA Plus.