Good theory about possibly some of them being there to see if there souls are able to be redeemed. I like that. I've said from the time that it first happened that it probably wasn't Walt typing. And how did the screen all of a sudden go blank the second Jack looked at it? Michael didn't type anything and he didn't hit any other buttons. He was about to respond to "Walt" saying "You have to come...." and then Jack showed up. Michael kept his hands off the keyboard and they started talking. Jack came around next to Michael and the screen was blank.