C1929 Evil Fist
The Xingyi Fist was a type of Internal Martial Arts that imitated an animal's form. It was a little similar to the Five Birds Play that Chen Feng had learnt from the beginning.
And this kind of Tiger Fist was naturally a type of Fist Position that imitated a tiger.
But don't forget, Chen Feng was a master of Xingyi Fist since a long time ago