The situation in Lassudral was changing by the second.
Having just dealt with about twenty Intermediate Rank Demons starting to probe the area, the fiery energy in the air suddenly became extremely turbulent and active. In such a state, the power of all fire-related Spell Techniques greatly increased.
But no Wizard, or Demon for that matter, dared use any fire-related Spell Technique because as the power of fire increased, it would also go completely out of control. Incineration might not occur, but incidents of fire-related Spell Techniques harming allies happened one after another.
Being unable to use fire Spell Techniques was one thing, but with the raging power of fire eroding the air, all other elemental Spell Techniques were suppressed as well. This change led to many elemental Wizards being at a disadvantage when facing Demons, finding themselves in a tight spot.