Go to the scene when the satinest's are "sacrificing" the skull to gain the devils powers. Pay attention to the knife. The lead satinest will eventually impale the knife into the skull to get the powers and its fails, duh. Satinest B will then mention that they should have stuck to the virgin sacrifice idea. Satinest A, the one that would tries to stab the skull for power, claims that they need a freash skull and threaten's Satinest C with the knife he used to stab the skull with. When did he take the knife out of the skull? Watch the scene again if you dont believe your eyes and you'll notice that the knife appears in his hand like magic, maybe Satan did give him his powers?