What exactly happened in Chapter 28?

 　　Bing Tong had lived here for a long time; the snake king of these snakes was practically her pet, which explained why the snakes obeyed her so obediently.

　　After leaving the forest, Bing Tong looked around to make sure no one was there, then went into her tent. Seeing Ying Lin still fast asleep, she smiled and lay down beside her.
　　However, Bing Tong was unaware that just after she entered the tent, a figure emerged from behind a tree. In the moonlight, the person's features were clearly visible. It was Yu Mo Zi Yu.
　　Zi Yu stood there watching Bing Tong enter the tent, a little curious: what was she doing out in the middle of the night?
　　Actually, Zi Yu had heard Bing Tong playing the flute, and he was curious who would play the flute at night, especially in a place like this. So he went out of the tent to see, only to see Bing emerge from the forest. This intensified his curiosity. Who exactly was Bing?
　　The next day, everyone got up very early. The last to rise was You Yun, who complained as he walked that Wei Yi hadn't woken him. Seeing everyone standing there, but with no sign of Wei Yi, he asked curiously, "Where did Yi go?" "Huh? Wasn't he in the same tent as you? I told him he usually gets up the earliest, but today we're all up and he's still not up," Yong Yu said, looking at him. "Then where did he go? I haven't seen him since I got up this morning," You Yun mumbled sleepily. "Oh no, he wouldn't be..." 'Going to look for the magic crystal!' Of course, Yong Yu didn't say this aloud, because Ying Lin and Bing Tong were standing right in front of them, listening intently. "If that's the case, he might be in danger. Let's go look for him!" You Yun said hurriedly. Magic crystals aren't so easy to find.
　　Hearing You Yun's words, everyone sprang into action. Although they always spoke in half-truths, Ying Lin understood, albeit vaguely. It's just that Wei Yi is missing! Mo Xier was certainly annoying, but Wei Yi was still You Yun's good friend, and Ying Lin was You Yun's girlfriend. Since Wei Yi was missing, Ying Lin should go look for him, even though she hated him.
　　Ying Lin then turned to Bing Tong and said, "Bing'er, you can rest here!" Bing Tong shook her head, and then Ying Lin said, "Then let's go together!" She then took Bing Tong's hand and followed them.
　　"Yi, where are you!" Xier shouted loudly. "Yi, if you hear us, say something!" You Yun also shouted.
　　"I...I'm...here." Hearing their calls, Wei Yi slowly opened his eyes and used all his strength to tell them his direction. Then, following the sound, everyone found Wei Yi. Seeing his numerous injuries, Xier immediately threw herself at him and cried. Wei Yi frowned slightly. The observant You Yun noticed his injury and said to Xi'er, "Xi'er, don't cry yet. Let's help him up first!" Hearing You Yun's words, Xi'er jumped up and, together with You Yun, helped Wei Yi up.
　　"Yi, what happened?" Yong Yu asked, looking at Wei Yi. "Don't talk about it here. Let's go back first! It's not safe here," Zi Yu said calmly. But he was right. Bing Tong had only given orders last night not to come here, but that didn't mean the snakes wouldn't come today.
　　Following Zi Yu's words, the group slowly helped Wei Yi back to sit outside the tent. Bing Tong had simply followed behind them the whole time, without any reaction. Back where they were, Xi'er found a first-aid kit and gave Wei Yi a quick bandage. After they finished bandaging him, Yong Yu asked again, "Yi, what happened?"