[Morsul the Dark]

Well firstly Mr.Balrog in khazadum flying over gandalf would be bad because gandalf is very mighty the balrog isn't stupid he knew he would have to go through him not over him...and once they were falling a balrog can't just flip over and flap its wings.it was falling with gandalf on its stomach meaning his wings were down....maybe you've seen a bird fly upside down but I haven't. Not to mention it's been in moria for who knows how long not much flying to be done in a mine. the wings would have lost the muscle to fly and as I said in a earlier post the wings were more likely meant for gliding not flapping if you get my meaning