Zhou Tian was extremely angry, seeing that he was about to kill the Tyrannosaurus but just then, an accident occurred. Although the explosion at that moment didn't damage Zhou Tian, it fatally destroyed the Magic Array he had used to trap the Tyrannosaurus— essentially, it had lost its original effectiveness.
Under normal circumstances, even if the Magic Array had been damaged, it wouldn't have been a big deal for Zhou Tian. Given his deployment, he could repair the Magic Array anytime if he wished.
However, the problem now was that the explosion that destroyed the Magic Array had come too suddenly. Before that, Zhou Tian, feeling confident of victory, didn't relax his surveillance on the Tyrannosaurus, but he didn't pay much attention to other directions.
Thus, when Zhou Tian wasn't paying attention to his surroundings, the sudden attack caught him off-guard.