In the kingdom of skull, King Norse did not allow any citizen to visit the world outside. Also only a person with a proper paperwork was allowed to enter or he was sent back. A wooden bridge was what connected the kingdom to the world. The king had appointed a sharpshooter who would check every five minutes on the bridge to check. After checking, he would go back to his hut and return exactly after five minutes again. The bridge took 9 minutes to cross.
A merchant was able to escape the kingdom without harming the shooter.
The merchant walked across the bridge for almost five minutes when the shooter was inside the bridge. Then he turned and started walking back to the kingdom of skull. On approaching the kingdom, he was asked of papers which he never had. Thus he was sent back.