The law of cause and effect does exist, it just works different in our material world than in the astral world. In our world most of the causes and effects have some linear motion, and you can trace where it starts and where it ends or will end, and with this… science is born, to study causes from our realm to understand the effects. In the astral world it’s not so simple to get a linear motion, just a simple thought pattern can increase or decrease an effect of a curse (a naturally pessimistic person may be easier to be cursed with) and so on, in the astral there are a lot of causes and can have a lot of effects.
You can curse a person with Marbas to make them sick, but the sickness or infection that they will be infected will vary (effect), and so is the cause (because you curse succeed due to several factors). And you know what? There’s a world or realm that the cause and effect does not exist. It’s called the Antiverse. So yeah… The Universe is a big place, and most of it’s territory (both astral and material) are still
undiscovered to the mankind.