>>20112142Demons cannot kill directly unless God allows it, a demon possessed person can kill someone though. Conjuring does not cause demons to appear, demons are around us 24/7 waiting for an opportunity to influence us in a moment of weakness.
Just as Satan came before the Lord and acquired permission to afflict Job so I believe the demons who respond through witchcraft and sorcery can only act if God gives them the OK first, If God didn't limit the power of the fallen angels then they would kill us all.