If Rumpel is stabbed with his dagger in the FT world, his dark power would transfer to the person who killed him because that’s what happened when he killed the first Dark One. I’m not sure that would happen in the real world. My thought is, maybe there’s some loophole in the real world, if in fact the only way to stop him is to stab him, if the person doesn’t have bad intentions for killing him, the power will not transfer.