I retreat to the no-magic area; however, instead of stopping there, I retreat to the entrance (blue marble door) so that I am not in the no-magic zone but they are. This way I can cast and use melee, and they can only use melee. I usually do this at level 8. It just takes some practice to make sure that they follow you all the way to the door and that you stop in the right spot by the door. If you retreat too fast, they will retreat and not follow you to the door.
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