JUST like what the staff said to them, the three started their discussion. Weirdly enough, all three cameras following them were shooting them from far-away. Because of that, the audience couldn't hear what they were discussing.
It was obviously done on purpose by the program team. Probably to give an element of surprise to the audience.
The comments on the barrage showed that the audience quickly understood this. But despite that, there were still many comments saying how unfair it was. But those comments were soon replaced by excited replies. It's because after the meeting, the three quickly started practicing the program they had planned.
Of course, this included the three changing into swim wears.