Guys: there had to be some other something on either side, because wasn't it inside? Maybe Gollum climbed over on a wall...he could climb really well, remember? So maybe there was just enough footing on a wall so that he could climb up, across some area of wall the spanned the pit, then back down to follow them. Remember, he climbed down the cliff with Frodo and Sam, so maybe he could climb across too.
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"I think we dream so we don't have to be apart so long. If we're in each others dreams, we can be together all the time." - Hobbes of Calvin and Hobbes
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