Being locked down in the very bottom level of the central underground prison..Muken you're one the worst criminals ever to be born in soul society...you didn't expect to ever be let out, until you hear the sound of someone coming down to you, Shunsui must've unlocked the central prison

You can see several of the captains from the gotei thirteen Infront of you...what could they want

Kenpachi: “So this is the worst Shinigami alive...”