"When you're dealing with time travel it's important to establish whose rules are in play. Is this 12 Monkeys rules where you can't change shit? Or Back to the Future rules where you can change shit but the time line is kind of easygoing about it? Or Terminator rules where you can change shit, but then maybe you can't change shit, and then you make a God-awful TV series and Christian Bale yells at someone?"