This summary is not the rule. The rule text controls.
When a person is brought before a magistrate on a complaint that they threatened to commit a crime or planned to hurt someone, the magistrate has to look at the evidence carefully. If the magistrate decides there's no real reason to believe the person actually meant to commit the offense, or that no genuine threat was made, the magistrate must let the person go free.
The magistrate also has the power to make the person who filed the complaint pay the court costs. This gives the magistrate a way to discourage people from filing complaints that turn out to have no real basis. It puts some responsibility on the person making the accusation, not just on the person being accused.
In short, this rule protects people from being held or punished based on complaints that don't hold up when the magistrate reviews the facts. It also creates a consequence for filing a complaint that isn't backed by real evidence of a threat or intent to commit a crime.