In Kubrick's Eyes Wide Shut, the protagonist Bill arrives at a secret party/orgy:
Shortly after arriving, he is warned by a masked woman to leave ASAP. Before warning him, the woman was taking part in a ritual, we see no way someone could have talked to her since Bill's arrival. She is taken away for a moment by a masked man, but only after she told him he is in great danger.
When he is found out to be uninvited, he is threatened but the lady steps and says she'll 'redeem' him. It is implied or said that whatever punishment was intended for Bill, she will suffer. Bill leaves, not knowing what will happen to hear.
Later the same lady is found dead in her hotel room (overdose) and we learn that Bill attended to her a night before, after a minor overdose.
Near the end of the movie Bill is told (and seems to believe) that the whole thing with the lady redeeming him was a charade to scare him (and possibly because people who have masked orgies like to play charades). The alternative, far less benign, explanation would be that the weird cult murdered her.
Now there are several ways to interpret this movie - everything is a dream (or several dreams) and if not one could see the cult in a more or less benign way. I think I found a logical hole in the more benign interpretation:
Since there was hardly any time between Bill arriving and the first warning. So a charade seems unlikely, maybe she recognized him despite the mask. This would make the film less ambiguous. Maybe I missed a detail:
Is there anything in a scene where the masked Lady could have been told to scare away Bill, before trying so for the first time?
OTOH, it would not seem very logical that the cult allows a hired sex worker (what Mandy appears to be) to decide on whether they punish a gate crasher or not.