Board Thread:WARNING - SPOILERS and FALSE INFO AHEAD/@comment-11853952-20130716233701/@comment-7737242-20130718175127

Well, from the preview after the episode, Derek seemed like a charmer and was seen smiling so he was probably a lot nicer- the girl dying and everything after that overwhelmed him and he underwent a trauma and mental transformation (to be cold, etc) so that's what probably made him change his eye color. A few more days!!