This could all depend on the type of manacle he was hanging from.If it was very thick and tight then cutting off the tumb wouldn't have done much good. If the manacle wasn't exceptionally tight then he could have done what Finn McCumhail did, swell his wrist. It's not very difficult and once he was hanging there he could let his wrist go back to normal and leg it. Of course some manacles had spikes digging into the prisioners wrist, in Morgoth's infinite cruelty I think he would have used this and in this case cutting off the hand and some of the forearm would have been necessary.
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Dear Saddam, Do not disunderestimate me.Yours G.W.Bush
You're not drunk if you can still hold onto a blade of grass to stop yourself from falling off the face of the Earth
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