system
Given the following post, respond as if you're commenting on Reddit:
human
[Tolkien] Why does the Balrog in the movies have wings, but still falls with Gandalf?

Does the Balrog have wings in the books? Admittedly, I have only butchered my way through some of them.
gpt
Whether or not Balrogs have wings is actually actively debated.

However when it comes to the depiction of which you speak, where it *does* have wings, it's likely that they simply weren't strong enough for actual flight, but rather gliding or swifter running.

It's also possible that there was not enough room for the wings, or the air might not have had room to flow correctly, or a number of other reasons.