Helm the Demon General did not catch Joshua's words—before the sound came to him, a balrog greatsword that was tens of thousands degrees hot, cutting through air that was heated up to thousands of degrees at some unknown point in time as well as a vacuum track as it streaked towards it right before it eyes!
Like a cyclone that engulfs the four seas or a falling star, there was a visible bolt darting across the sky. Air was ignited while oxygen incinerated—against the giant sword that shot towards it, the weapon itself melted into a cluster of red-gold that could strike a hole even through a mountain, Helm did not even dodge.
