On the defending side, Hu Bing's hiding spot was very risky. He was lying in ambush in a disguised spot outside of the defense zone. In his words, he was planning to shut the gate once the enemies are in. When Xu Cheng and his team passed by him and engaged with the defending side, he would appear from behind Xu Cheng's team and claim their heads.
This was a strategy he arbitrarily decided, and the other members didn't really agree with it. After all, their entire game plan was to play around him. So if he was exposed or got eliminated first, it would be a real uphill battle for the rest of the team against the team of veterans. In fact, they knew Hu Bing was just trying to show off, but they couldn't refute. He often did this before and there had been successful occasions, so they didn't show their disagreement too directly.