Isn't a Balrog a Maia? I doubt they really tire so lets assume ALL the dwarves did attack the Balrog it's not as if they all attacked at once. just can't be done. A balrog could I think easily take on 10-15 dwarves at a time.
Also, as somene else mentioned the Balrog probably picked off a lt secretly. cause stirs and whispers and a general fear.
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Morsul the Resurrected
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