Why does everyone expect angles to be perfect beings? Can they not have flaws like everyone else? Mark and Jack, are indeed both angels. They watch over the people on Earth, which made Mark think. Is living in a perfect world... fun? Mischievous things looked fun, evil things... Mark wanted to get more out of this 'cured life', wanting to take his best friend with him. He was fed up with feeling like he wasn't pure. Jack of course couldn't go, be couldn't leave the father, and wanted his best friend by his side. Having to go after him, Jack knew... Mark had gone rouge.