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The user converts the chakra absorbed from the Dark Release: Inhaling Maw technique into light blue flames, turning it back on his enemies with amplified strength to blow them away.
The light blue flames seen in this technique are likely a reference to the "Will-o-Wisp," as the "Dark" (冥, kurai) in "Dark Release" (冥遁, Meiton) means 'gloomy; ghostly; night; underworld'.