Their captain thought the same, as she sent in their team channel after that announcement was made;
Nereid: [Don't be distracted. Stick with the plan. Yu-er, where are the members of team Yunyue right now?]
Reading that, Yin Meiyu quickly checked the locations of the members of team Yunyue. Just like what she thought, most of the members of team Yunyue were going downriver. It didn't really come off as a surprise since it's not like they could have another destination. She just wondered how they were travelling without the raft.