Well, he is inside a pyramid ship, so probably a darkness zone, preventing healing and revival. Combine that with his tussle with the scorn, which made have given him some sort of wound to the leg tainted with blight, and you have a limp.
English
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Ghosts can still heal in a darkness zone, they just can't revive without help. Remember our guardian plus crow were also fighting on the pyramid and both were healed by our ghosts. Also if you think back to the red war, our ghost reveals that even without the light they can still heal us, however they could revive us.
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Yeah 'spose you're right.