Han Li didn't save Zhang Tie because he wasn't sure of Zhang Tie's identity and didn't know whether he was a friend or a foe. In the novel "The Legend of Mortal Cultivation", Zhang Tie was possessed by Doctor Mo and turned into a puppet, chasing after Han Li. Han Li had discovered Zhang Tie's whereabouts during his escape. However, he didn't attack him directly. Instead, he chose to observe and wait. He wanted to judge Zhang Tie's identity and intention by observing his behavior and response. In the end, Han Li discovered that Zhang Tie was a puppet possessed by Doctor Mo. His actions and reactions also proved his identity and intentions. Thus, Han Li decided to save Zhang Tie and help him regain his freedom. While waiting for the TV series, he could also click on the link below to read the classic original work of " The Legend of Mortal Cultivation "!