Why would the Balrog have wanted to leave Moria?
Having flown (whether by wing or foot [img]smilies/wink.gif[/img] ) from the War of Wrath, it made its hiding place in Moria and stayed there for many thousands of years, only coming out to slay a few Dwarves when the noise of their mining got too close and gave it a bit of a headache.
My understanding is that the Balrog owed no particular allegiance to Sauron, so there was no reason to come out to aid him (and it probably served Sauron's purpose anyway for it to remain in Moria). Since, with all those Orcs around, it probably felt pretty safe down there, I don't really see any reason why it would come out at all, let alone risk attacking a powerful Elven realm.
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Do you mind? I'm busy doing the fishstick. It's a very delicate state of mind!
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