Han Sen's mind was like steel. He focused and did not allow the Sea of Soul's discord to affect him. He punched towards Ancient Devil's hand.
This was an opening for Ancient Devil, but Han Sen also thought that it was an opportunity. His Dongxuan Aura was not maxed out yet, and because of that, he was unable to place one finger on the donkey. It was best to end these proceedings than continue with a stalemate.
Fists and hands swung through the air, but there were no collisions to be seen. Han Sen felt as if he was powerless, like he had been sucked into an infinite hole. His power was being drawn, but nothing else happened. This drain sapped his power and nothing else.
Han Sen used some of his power and realized he could not escape Ancient Devil's hand. His power kept on getting sucked into Ancient Devil's body.