There are 3 different kinds of cave trolls, the moria cave troll was not the kind that could get turned into stone. Actually the witch-king is holding a long sword in his right hand, and calling for the ring with his left. When Frodo pulls the ring back, you see the witch-king with a dagger in his right hand, nothing in his left hand, and no long word in sight! I believe Legolas was actually rideing on bundels or robes, but still, you have a point, that isn't bareback (as the book states)! Borimir's roving hand happened like this: The cast filmed Aragorn's lines (with just Viggo staring at the ground) before lunch, then went off to get lunch. After they returned, they did Borimir's lines (with Aragorn). Borimir did his lines with his hand on Aragorn's shoulder, but since he wasn't there to have his hand on hi shoulder during Viggo's lines, they screwed up. When they switched the scences in, that created Borimir's 'roving hand'.
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