Maybe he got bored and Paul decided to give him this one? Though why five years to do that? Hadn't thought about the punishment angle, but that's an interesting way to put it since I wonder if Nikki might have slightly reconsidered or not pursued Emmit with the same vigor if she knew that he didn't even mean to kill Ray. Not to mention that he'd already confessed to what he'd done. Guess she just wanted justice in her own way. But when she trains her gun towards the officer, even though she was intending to hit Emmit, she signed her own death warrant.