Bringing someone's Seal of Power Upanishad into one's soul was an extremely risky deed.
He trusted that Emperor Sea Shark would send a part of his power Upanishad to Shi Yan. At the same time, Shi Yan at his Peak of Immortal Realm dared to guide Emperor Sea Shark's power Upanishad to his soul altar. Didn't that mean he trusted Emperor Sea Shark?
If Emperor Sea Shark had another idea and fought Shi Yan in his soul altar, Shi Yan wouldn't be able to endure it. His soul would get hurt badly too.
The transparent water drop fell into Shi Yan's Sea of Consciousness. The soul pond in his Sea of Consciousness emitted Dark Energy right away. The power Upanishads in his soul altar could smell the aura of the intruder. They became cautious and wanted to attack that thumb-sized water drop.
Focusing, he continuously asked himself to relax and quiet down. He had to do that to calm down his power Upanishads and his restless mind.