After three years he was finally released. One of the top students of the Master he had killed came and declared his intention to avenge his teacher's death, inviting Kuo to compete with him. People knew that for the three years he had been in prison, Kuo had been manacled hand and foot, unable to move with much freedom, and so unable to fully practice his art. All thought that his health was probably weakened, and his vehemence doubtless dimi nished from its former state. His opponent was undoubtedly taking advantage of all this to get his revenge.
As soon as they crossed arms, however, Kuo struck violently with both fists, and his opponent was actually thrown back some fifteen to twenty feet and collapsed. It was very obvious that everybody was mistaken in their belief. During the time that he w as in prison, even though Kuo Yun-Shen did not have complete freedom of movement, he thought incessantly about his fighting style; although his hands were chained, borrowing from Hu Hsing Hsing-I's Tiger Form) he was able to come up with a new hand style. Morning and night he developed and practiced his "Tiger Striking Hand".
There exists yet another version of this same story, told in A Biographical Sketch of Master Kuo.
Kuo Yun-Shen was appointed as warden of Shen County. When he went to take over his post, the county magistrate presented him with money and gifts in recognition of his achievements. Because of this he drew the ill-will of the local bandits, who took every opportunity to make trouble for him.
One day, Kuo found himself face-to-face with a sword-brandishing brigand. He easily took the sword from him, and using it to return the attack hacked him to death. The penalty for killing a man was very severe, and Kuo found himself facing this penalty . But the county magistrate was fond of Kuo and so lightened his sentence to only three years imprisonment.
When the day for his release arrived, Magistrate Ch'ien asked, "Have you lost your kung-fu?" Kuo Yun-Shen declared "Absolutely not." His glance happened to fall on the courtyard wall. He struck it with his "Tiger Fist", and with just this one blow, the wall collapsed in a thunderous roar. For the three years that he was in prison, even though manacled, he found a way to practice, and created his "Tiger Fist". For this reason, his fame shines even today.