In the movie Upside Down, a romantic relationship develops between a budding woman and a maturing man respectively living on two planets entangled through two opposing types of gravitational forces. Each world is constructed of material unique to its gravitational force. Matter from each world falls inward torwards its respective planet. The movie describes how matter transported from one world to another eventually combusts. This effect is seen when the more oppressed world's primary heat source for the man's home is shown as combusting material from the other world. This effect is more noticeable when the man travels to the other world using other-worldly matter as weights to sustain him on his partner's planet. And here is where my problem is:
If the man uses matter from the other world to weigh himself down towards the woman's planet, why do the weights combust? They are gravitationally attracted to their planet. He is gravitationally attracted to his planet. He is on the wrong planet - he should be dead!