Before that fateful day of the fight, Xiong Da had conversed with new found friends he had fought within Jin's shop. In particular, he had become good buddies with Bin Yong and his group of friends. Their battle against the zombies in the Great Wall of China Instance had bonded them to a level that was more than just friends.
Not just them, Yue Han called his sister Yue Wen along and she too contacted Se Lang and the rest of the police cultivators. Apparently, they too knew who Xiong Da was and did not mind helping. However, not all of them were able to make it but Se Lang and Xue Ping promised to help.