You are not qualified!
Jiang Chen, Lu Tianxin, and Wu Dongmin were initially taken aback by the sudden turn of events. But, they were elites for a reason, they recovered pretty quickly. They didn't know how Duncan could start butchering people like this so easily. Even though they understood the reason deep in their hearts, they instinctively denied it.
Along with their group, they immediately sprang into action. Wu Dongmin and Lu Tianxin went ahead to attack Duncan and deter him from continuing his massacre. Jiang Chen took the role of defense and tried to minimize the damage caused by Duncan's attacks.
The others in their entourage also unleashed several attacks trying to deter Duncan and keep him at bay. The sheer number of attacks made Duncan back off a bit and provided the fleeing cultivators time to regroup with the entourage of the three.