"The kid says that the person just then was his third brother." Bo Wen was describing the situation. No matter how big the grudge was between the two of them, they could put it aside for a while. The situation was a lot more serious than they had thought, and they had no way to know what the village the kid came from was really like. But one thing they were certain of was that the village would be more powerful than Bo Wen and the rest of them. And they could see from how they had acted that they weren't benevolent. That had made them have to be very cautious. Even though Bo Wen and Chen Mu were enemies, after so many days of travelling together they had established some mutual trust
Although that trust was somewhat fragile and unreliable, when it was compared with a bunch of complete strangers who were powerful and had a certain hostility, that was enough to allow them to drop their prior grudges for a while.