User blog comment:Thailog/Ep. 204 "Salvage" discussion/@comment-4955384-20120519220032/@comment-4454131-20120520024303

anon, the spell worked by Prespective. For the most part, people are considered/consider themselves adults at 18. Red Tornado is a robot yet as a sentient one, he percieves himself as an adult and was therfore sent to the adult world instead of being split between the 2 worlds like the helmet of fate. Since Nabu is bound to the helmet and is an ageless entity, he got split btween the worlds. Klarion, being childish, stayed in the Kid's world. I also think he chose to stay there as the speel probbly works best when at least one of the casters is present in each world.