In the movie Hero of Jason Wu, what fist did Zhen Chen hit Hottingen with?

In this film, Zhen Chen inherited the foundation of Huo Yuanjia's boxing and combined the advantages of western boxing he learned during his study in western countries and Japanese countries. His style of play is somewhat similar to Bruce Lee's Jeet Kune Do, and he pays more attention to actual combat, instead of sticking to China's traditional martial arts, only paying attention to moves. Huo Yuanjia's fan-tracking boxing is also very powerful. Huo Yuanjia died of poisoning, but Zhen Chen in the movie had not yet learned the art of Fan Trace Boxing. .