Partidge (RJ) is a great Actor. He'd have to be right? He was faking be hurt / killed in tonight's episode to throw off Teresa (and the audience). All 7 Suspects are in on it though, which is how RJ was able to "predict" (in Laura Li's video) the list Patrick would eventually narrow down to. It's not a prediction or getting inside Patrick's head, it's simply a way to mess with Patrick by using the truth that Patrick would eventually realize, but not fully understand the extent of. He was counting on the fact that he would be hesitant to tell anyone, but would likely confide in Teresa eventually, at which point he could mess with Patrick (and the audience a little more) by nabbing Teresa, then letting you think she could be dead (which she's not btw).