I agree with Lindolirian's intimidation theory. The form of Balrogs' wings, as I invisioned them, were shadowy, but with form. Not possessing form enough to actually fly, but enough to frighten its...victim(s).
As many members and a few non-members repeated numerous times, somewhere in the FotR, Tolkien mentions shadows emerging from the Balrog like wings.
Please, whatever anyone wishes to think is great; I'm a believer in forming one's own visuals of characters, but I intend to stick fast to my imagination.
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