What I found odd is that the movie suggested that the marijuana use of "the fool" negated the mind-altering/manipulative drugs they were using. Which... You'd think they would've have thought of that considering this ritual has been done for such a long time and not once they've encountered a pot-smoker?
I saw it a second time tonight. Amy Acker's character has a line that I'd missed the first time. She says that her team was supposed to swap out the stoner's pot with their own, but they "missed a batch."