Preventing the return

It seems fairly easy for someone to come back, but in my case I want to learn how to "block" something, in order to come back with as much difficulty I can. In some cases it's mentioned people are stuck there temporaly, but I want to get stuck there consiously (not forever).

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This is a very touchy subject but if I were to answer you in the kid friendliest way possible I'd say that you're looking for a way to either keep them entranced (putting it lightly) or you can cast some form of protection around their body (in which case you'd need to specify body and mind as separate entities).
You could also try binding the astral body to a distant object/persona/place and you can try banishing them the way you would another spirit.

Of course not to recommend anything...