Quote:
Originally Posted by The Saucepan Man
To be honest, I am looking for a solution here to the Balrog wing debate. If, despite being tied to their bodies, they were still able to shape-shift, then a Balrog could have wings - or not - depending on how he felt that day. 
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Not if the Balrogs have been similar to the Istari. The Istari were bound to the flesh to serve one purpose: helping the free peoples of Middle-earth against Sauron.
Melkor could have made the same thing with the Balrogs. He bound them to the flesh, so that they could serve them as warriors. With one difference, he diminished not their power like the Valar did with the Istari.
If there has been a connection between both partys (we don't know for sure, it is just a thesis), the Balrogs are not able to shape-shift.
And I agree here with Neithan:
if they could still shift shape then I am sure they would have done so to escape falling to their deaths.