That episode was amazing!
With the Nathan thing - he's immortal but as the guy turned him in to a "vegetable" I think even if somebody kills him, he comes back in the state he was in. So if Simon killed him to put him out of his misery he would be alive again in the same state. That's what I think anyway. I got so in to the episode I forgot all about Curtis' power of turning back time lol. Also, what did they do to the milk guy? Surely just beating him up and saying "don't tell people about your power" would make him want to do it more? Unless they killed him?