It's common practice for shows like Survivor to cast alternates who are prepared to take someone's spot if someone backs out between casting and the beginning of filming. For Survivor 49, two alternates joined the fray and host Jeff Probst explained why with a pointed warning at future players. "What I can say about the reason we made the move is this," he told Entertainment Weekly in a story published Thursday, August 21. "Survivor has rules and standards, and if a player crosses that line, we act. It's one of the reasons we bring alternates, is to have our own insurance.