on the topic of cal i think he is the perfect representation of wolf in sheeps clothing. it's like the directors knew exactly what their motive was when casting the actor for cal, someone sweet and completely innocent and would throw you off the plank when they reveal their true colours which is what cal did. at first I thought he was being manipulated by andre but upon closer inspection he was just as sick if not sicker than andre. he only showed his true self with andre because they both understood each other better than anyone. and throughout the movie we see that cal has no apprehension whatsoever about their plan, he even wants to write a letter to his brother because he knows he wouldn't be returning. and he even recorded the whole thing because he wants to make history, he was in it deeper. dare I say, deeper than andre. we saw cal's true colors when the shooting actually happened, when he was screaming at the girl to shut up and also killed greg. in the end when andre and cal were cornered, cal was the one who motivated andre to shoot himself. andre was not with it at first but cal just helped calm him down.