He was crippled. Not only did he lose an arm, but his whole side was broken. Even the other side that wasn't injured was affected, with barely three levels of the Art of the Golden Shield's power. He could still be a small gangster but it was impossible for him to be a master.
Even if the injuries healed, the missing arm would still make it more difficult to train from the beginning. Besides, even if he trained from the beginning, who knew how long it would take for him to restore his current power? Fortunately, Master heard about him getting beat up like this and threatened to avenge him.
Master already promised him, once he has arranged the matters within the faction, he would send another master to the boss and come to Songshan City to help avenge him. He wanted to eliminate Lin Yi and the Chu family.
