Blood, not so much.  He's more like the go-to guy on occult and magic. He really is a scholar/demonologist, but he's not evil, even though he might appear menacing.<br/>The demon is a different story, but because of his binding he was previously only unleashed to fight otherworldly enemies like rogue demons and undead. Now that the pair is free from Merlin's spell and has their own agenda... we'll have to see.