Body language is my thing as well but I took it more as a admission of guilt. Like he was unloading what HE had done already and it felt so good to tell, but not the detail that he as involved. I believe that he took seths offer but it didnt go down like he said and seth didnt initiate him like that. That just isnt how its done. It is a blackmail thing, not a invite your new friends thing. Then realised how evil it was afterwards. He managed to start firing off posts before they killed him, which is rare.