In fact, the story about Song Clan was too difficult for Ye Xiao to figure out on his own!
"Song Xuan! Finally, you came out with guts!" Song Fei laughed. He was extremely arrogant. "I thought you would just stand aside watching me beat these outlanders up. I thought you would just leave with your tail between your legs. Hahaha. Good. Brave. Impressive!"
The three of Ye Xiao understood what was happening from what Song Fei just said.
He messed with Ye Xiao in order to piss off Song Xuan. He must have seen Song Xuan when he ran pass this place, so he turned around and started to bully Ye Xiao and company—at least he believed he could bully them. That was what happened. He didn't mean to truly offend Ye Xiao.
However, because they finally understood why he did it, they felt… that Song Fei was truly a nasty bastard. [Just go directly to Song Xuan if you want to piss him off. Why do this to innocent people?]