Well, here's another thing I can't figure out. Quentin is virtually immortal because of the portrait. Whatever happens to him will happen to the image. So there wouldn't be a better allied enemy against Jeb than Quentin. Take, for instance, today's episode where Jeb wards him off with a knife. Technically, he could stab away as if Quentin were a pin-cushion and nothing would happen. Imagine Jeb's surprised look as Quentin laughs, Jeb wondering exactly what type of creature he is. Quentin could then just smuggly say: "There are more creatures in heaven and hell than you know." Of course, Jeb could then try everything possible to discover what Quentin is, while being rather afraid of him, which would've added a real interesting dimension to the story.
Gerard