Wang Zhifan, who strongly suspected that the purification ritual mentioned by Mr. Rogen might have problems, approached Sandra and hinted to her in a somewhat obscure manner that the purification ritual might be a scam or decoy, urging her and the entire team to be cautious.
He didn't speak too directly because he considered that he didn't have much authority or presence in this mission team, as everyone evidently trusts Mr. Rogen. As an outsider, if he outright claimed that Mr. Rogen might have some scheme, it could lead to undesirable consequences.
At the same time, this was also because he wasn't completely sure that something particularly bad was going to happen next. It's possible that what Mr. Rogen said might be true, or half-true leading to a relatively good outcome. In that case, he would just become an obstructive clown.
