Gandalf the Grey has proven to be superhuman and had to imbue it with loitnin' to finally kill it after fighting for days.
The Balrog can't fly, but its whip was shown to have absurdly long range.
But the main issue is... It apparently appears right in front of them. The heat alone would be distressing, actually being hit by it would end either of them.
That said, if Voldemort or Snape can apparate and stay out of its range and pummel it with spells, they can probably win, yeah.
The Balrog is a Maiar spirit on the same tier as Gandalf (another Maiar). To slay a Balrog requires one to be on an equivalent level or higher, which is why Gandalf's attacks and spells were efficacious against the demon. Gandalf's comments of, "This foe is beyond any of you...Swords are no more use here," establishes the Fellowship's inability to hurt a 'greater' being.
Durin's Bane had insane constitution and stamina. It survived after free falling kilometers at terminal velocity, and then battled Gandalf all the way up to Zirakzigil's summit, and then fought the Istari for two days nonstop at the peak. And it must have absorbed countless spells and strikes by Gandalf before that ultimate Lightning Blade killed it.
If we go by the reasoning that only the attacks of a demigod can be effective against the Balrog, then the demon incinerates Voldemort and Snape.
Otherwise, if the wizards' spells 'work' against the Balrog, then I'm afraid they only win because they have Avada Kedavra, which is instant death.
Originally posted by Korto VosBeing magical fire and what not I think it's not that easy. It falls into what you personally believe. I was just curious is all I don't see Voldemort resorting to this attack anyways due to it's appearance and reliance on fire.
Yet, both Fiendfyre and the Balrog's flames are red, meaning they are in the same relative position in the electromagnetic spectrum, and ergo meaning their temperatures are relatively the same.
Originally posted by NephthysIt was a test question to establish any source of heat if it would affect a Balrog. You either believe the fiendfyre does or doesn't. Voldemort wouldn't use this tactic here anyways.
He'd probably get ripped apart by the pressure, no no he wouldn't. But Fiendfyre isn't a sun, so what the ****?