oh wow! for some reason, that was a point that hadn't even occurred to me. but of course Khazad-dum was around WAY before the Balrog would have fled there in the War of Wrath. wow weird.
Gandalf talks about a lot of tunnels and caverns and such way underneath Moria that weren't actually of the Dwarves' making...maybe it came in through there somehow. *shrug*
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