Found this passage in HoME 7:
Quote:
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Legolas bent his bow. Then he let it fall. He gave a cry of dismay and terror. Two great dark troll-shapes had appeared; but it was not this that caused his cry;...a figure strode to the fissure, no more then man high yet terror seemed to go before it. They could see the furnace fire of hsi yellow eyes from afar; it's arms were very long...
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'Man-high', as Unfinished Tales tells us is about 6 foot 4, the average Numenorean height. So he ,we can see a Balrog in early LoTR sketches, and a picture of what Balrogs looked like in the Silmairillion's of HoME 4 and 5, though they were a lot weaker here then in Tolkien's latter conception that only '3 or 7 ever existed'.