Well, I think on second units it's all about execution. Because you come in there, you don't have to worry so much about the studio and all the other actors and all that.
You may shelve your Shakespearian plans for the present. I am going to play Peter Pan.
Unlike some of the time-travel movies I love, like 'Primer' or '12 Monkeys,' 'Looper' is not about time travel. It's about this situation that time travel creates and the people dealing with that situation. So narratively, the big challenge was to have time travel get out of the way.