On glancing over the thread, I think several people have struck on the correct answer but not realised why. In my view, Gollum knew where the exits to Moria were, but (as has been cited) couldn't use them: one he couldn't open, the other was guarded by Orcs. When the Fellowship came through, Gollum knew where they were headed - it's pretty obvious, there's only two doors and they're moving east! After checking that they weren't up to anything sneaky in the night, he simply went through the eastward arch and waited for them in sight of the Great Gate. I doubt he expected them to show up with a Balrog in tow, but the plan worked.
Why is this the correct answer? Because
it's exactly what he did to Bilbo!
Quote:
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Originally Posted by Riddles in the Dark
“It said so, yes; but it’s tricksy. It doesn’t say what it means. It won’t say what it’s got in its pocketses. It knows. It knows a way in, it must know a way out, yes. It’s off to the back-door. To the back-door, that’s it.”
[...]
“Then let’s stop talking, precious, and make haste. If the Baggins has gone that way, we must go quick and see. Go! Not far now. Make haste!”
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Having lost track of the person with the Ring - or, in the LotR case, having seen them enter the larger halls where he couldn't guarantee he'd stay hidden behind them - Gollum simply went on ahead to the exit and waited to catch them there.
Come to think of it...
Quote:
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Originally Posted by Shelob's Lair
Sam gasped and gathered all his remaining breath to shout. 'Look out behind! ' he yelled. 'Look out master! I'm' - but suddenly his cry was stifled.
A long clammy hand went over his mouth and another caught him by the neck, while something wrapped itself about his leg. Taken off his guard he toppled backwards into the arms of his attacker.
`Got him! ' hissed Gollum in his ear.
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... he did it a
third time!
hS