The red flames didn't affect the body, their heat targeted only the mental sphere.
David's team was sitting on the burning floor, the flesh and clothes of the cultivators were unaffected by the fire but their expressions showed the struggle that they were going through to resist the pressure on their seas of consciousness.
Noah, like the strongest in his group, was a bit better off.
The speed at which his mental sphere enlarged had increased by a large margin after he bought the fourth Kesier rune, he had resumed training at a higher speed after he secluded himself for the breakthrough in the third rank.
Those months coupled with the three years of training using the "Breath" in his mind put him in a better position compared to the other cultivators in his team, only David and the others in the solid stage of the third rank had a mental sphere that could compare to his.