You are all forgetting that he had some trusty arrowheads with him. Precise enough and sharp enough to make fine cuts. And also, his sword was no turkey slicer. It could cut through bone in a jiffy.
But, as was said before, the hand trying to be cut off precisely was probably swollen. That just complicates things. And Melkors spell probably would stop his hand from being dragged through anyhow.
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Son of Isildur.
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