Although Pan Shi's ability still seemed powerful, Zhou Tian unexpectedly discovered at that moment that his opponent's situation was truly as bad as he had imagined. If things continued this way, there was a good chance Pan Shi might die due to his own ability.
Because just when Zhou Tian had attacked Pan Shi, he observed that Pan Shi's body had already started showing signs of energy transformation due to the effect of his ability. Although this situation didn't immediately mean that he would lose his life because of it, Zhou Tian believed that if Pan Shi continued, he would likely be completely transformed into energy.
Transforming into energy didn't inherently mean danger, as many abilities allowed the user to turn directly into energy. If transformation into energy were considered dangerous, then one would easily suffer in the current world.