Jeff is an alter who integrated a while ago, an extremely smart teenager integrated with a demon-like alter, creating the Jeff that I know now. Yet during some events that had happened a few days ago (Brian breaking loose, going on a rampage on the inside), I am sure I saw what looked like the demon he integrated with. The growl, the terrifying eyes, the way he attacked Brian to stop him from hurting Marina, everything looked like the demon being back. Yet a little while later he was the Jeff I knew again.
Does anyone else have experience with things like this?