There are rules that come with traveling into another world. One: The world will try to make sense of your existence. It is unfamiliar with you and try to make you fit in. Two: There are core sequences or events that cannot be changed completely. Minor events that do not effect the overall outcome may change. Three: Every world has patterns concerning the unexplained, magic, myths, and so on. Noticably going beyond the patterns too much may cause the world to shatter or flinch. Shattering means no more world, no more you. Flinching may cause a brief setback in time, try again. Four: Do not share outside information directly related to your original world. Common knowledge or indirect information is acceptable. Five: If you know information about the future, do not inform the natives. The world will reject the information from them.