[Occults] What do you think the powers and weaknesses would be for

One weakness I'd like to see for witches is the possibility of a spell bouncing off a targeted sim and hitting the spell caster instead. Maybe if they're in a bad mood or have low energy or the target's mood is the opposite energy of the spell (positive spell bounces off of sim in bad mood, negative spell bounces off sim in good mood). Could call it instant karma or something like that.