The four teams had to be divided into two for the challenge. Team selection was to be done via drawing of lots. Considering the animosity between Shen Si and Huo Xiang's teams, for once, the director did not try to make things difficult for them. He changed plans last minute, and made team selection voluntary.
Shen Si and Wu Miao were rude and pretentious off late, so neither Yin Hai nor Xiao Moling wanted to team up with them. Since there was animosity between Huo Yao and Shen Si, they knew it was impossible for them to team up, as well.
As the eldest guest on the program, Yin Hai volunteered to team up with Shen Si and Wu Miao, hence, everyone was spared from any awkwardness.
Xiao Moling was introverted in nature. He was relieved when he did not have to team up with Shen Si.