I think with as powerful as black magic and demons are, they are obliterated when a person gets the wherewithal to simply ask “Why?” and mean it. The search for truth always leads in the complete opposite direction of Satan. He throws crap in the path and many stumble on those things but that insatiable desire to learn truth is, IMO, the very expression of free will. The devil only knows force and control. Or, put another way, “no will.” Makes one a slave. Trauma can make a person give up, let go and just accept what happens. That’s when you’re a slave. People exercising free will learn more than others, understand more than others, have more joy than others, become better people over time and use their imagination. You may be boxed in and limited by health or economics but you’re no one’s slave. All because you ask “why?” (Or “why should I?” as the case may be) I don’t think black magic, hypnotism, spells, etc work on those that acknowledge their own independence.