Lu Heng ignored the two sisters' shock and casually tossed an intact Azure Spirit Flower into the cauldron.
"Flame control does not require blindly pursuing the speed of hand seals."
Lu Heng's voice was steady as the Heavenly Flames in his palm transformed into two thin streams and slipped into the medicinal cauldron.
"No matter how fast the hand seals are, they are useless if your soul perception cannot keep up. The Green Lotus Flame refines the roots and stem, while the Sea Heart Flame cools the outer layer and protects the petals. Extracting them through the clash of hot and cold does not require constantly changing hand seals."
As soon as he finished speaking, a crisp cracking sound rang out from within the cauldron.
Under the assault of two completely opposing temperatures, the impurities in the Azure Spirit Flower instantly stripped away into ash. What remained became a crystalline emerald liquid that floated in the air, its purity reaching an appalling level.
The entire process flowed as smoothly as drifting clouds and running water, taking only three breaths.
Cao Ying looked at that droplet of medicinal liquid, nearly free of impurities, then at the charred lump inside her own cauldron. Her whole body seemed to wilt.
"Not only do you have Heavenly Flames, but your flame-control methods are so crude and effortless. Compared to you, those instructor elders at the Pill Tower are practically teaching people how to carve flowers out of wood."
Cao Ying grumbled sourly, but her body was far more honest. She moved closer, grabbed Lu Heng's sleeve, and pressed him for an answer.
"At that instant when the hot and cold collided, how did you split your soul force into two entirely different fluctuations? Teach me already!"
Cao Yue also stepped forward, her beautiful eyes