Season 2/3 AU - Serial Killer Will! Not that that should surprise anyone.
After chasing Hannibal across Europe, Will had decided that enough was enough and to embrace his own darker urges. He helps Hannibal take care of Jack but Hannibal ends up taking the fall for the both of them. Will bides his time and eventually helps spring Hannibal when a new killer starts attempting to move into their territory, with them as his targets.
Music - Survival by Tesseract