Shi Yan suddenly stopped.
He didn't understand why the two flows of feeble souls, which had originally hovered around inside his body, had disappeared all of a sudden as if they had been grabbed and thrown out by someone's powerful sensing forces.
Those two souls were not really strong, but they thoroughly understood the way to control the soul forces. They were not supported by any other soul senses except for their own admirable feelings.
Although Shi Yan didn't have a profound understanding of souls, he had only based it on his own interests to discover all of the secrets of those two souls.
When those two souls disappeared, his connection with them was also interrupted.
He could just only identify the general direction of those two souls. When those souls vanished, their direction had also changed which left him no time to take actions and was hardly able to define their exact direction.