Farewell and Fear The Ripper

Sablier never had a serial killer, never one so young, never one so deranged. They never had a chance to stop the maniac. He never kept anyone alive, but that does change when he keeps Elliot Nightray, a teen no older than him. The Ripper never kept a victim, so why did he keep Elliot? What can he gain from a boy on death row, maybe a shred of humanity. Sucky summary, M for gore