"Burn," Kayden began to consume all the oxygen in the place with a simple large-scale fire spell, Nathan's carefree attitude disappeared as he began to create oxygen to maintain his dominance.
Kayden only needed to organize some pentagrams and simple matrices so that the fire was infinite, this forced Nathan to come out of his camouflage more often to try to break Kayden's concentration.
They could do both simultaneously, but for Nathan, it was a little more difficult, as he had to concentrate to cast the spells. The boy was a genius but hadn't yet lived long enough to diversify his skills.
This situation caused Nathan to start attacking Kayden directly, his speed was ridiculous, but Kayden was in such a ridiculous state of strength that he could keep up with his opponent with only a slight disadvantage that was compensated by battle experience.
BOOOM!