Hm, putting Jolene in front of the green screen still makes little sense. Connor was facing a double, right? A double who was supposed to be edited out and replaced with Jolene... The fact is, the double would only make things more complicated. It would have been much easier and cheaper to only shoot Connor (a decent enough actor to fake surprise in front of thin air, Star Wars cast did stuff like that in all the prequels, they only had an AD tell them where to look, when to react etc).