Li Tian seemed to have known that the other party would do this after he revealed the San He gang's name.
If they were the higher-ups of the United Bamboo Gang, their attitude would be the opposite. They would fight Li Tian to the death. However, these four guys weren't even official members of the gang. Since they dared to provoke the Triad, the United Bamboo Gang wouldn't stand up for them. They would have to bear the consequences.
The main reason was that a few years ago, United Bamboo Gang and Sanhe gang had a fight. As a result, they both suffered losses. The two gangs were almost annexed by some smaller gangs. At that time, they had a secret negotiation--if Sanhe gang didn't bully United Bamboo Gang, Sanhe gang would not attack you. Therefore, Sanhe gang also said the same thing.