Zhou Tian also noticed that Zhang San had to defeat the White Tiger before their battle was decided. Although it looked like Zhang San was seriously injured, if he had wanted to, he could have assisted Zhou Tian immediately. However, it was clear that Zhang San did not do so at the time. Zhou Tian was not very concerned about this situation, but he was not completely indifferent to it either.
One could say that Zhang San's behavior at that time had already proved that he harbored ulterior motives. If he had truly been loyal to Zhou Tian, no matter how severely he was injured, he would have tried to assist Zhou Tian as soon as his own combat had ended. There would have been no reason for him to stay and heal his wounds like he was doing now.
However, Zhou Tian quite understood Zhang San's response and, because of that understanding, he had no intention of blaming him for his actions.
