You need to dispose of any patrols in the hallways. Nobody in the cellar prison needs to be killed and nobody in the halls (other than the final route to the stairs) needs to be killed.
But yes...everyone from the last room where you pick him up (after the release from the cell) to the stairs (including the staiway) needs to be taken out. You'll have to take out some of the lone guards down the perpendicular hallways as well.
I don't think you can escort him out otherwise, but who knows. Might be a trick I've overlooked.
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