The Ratbridge Police are a hot mess. They ride bicycles with wheels that are many-sided rather than circular, leading to squeaks of pain when the bicycles bump along on the roads.
Because of this, the police are known as Squeakers. Better than Squealers, right?
The Squeakers show up on the path leading to the pirate ship, and Snatcher tells the Chief Squeaker that they were just attacked.
Before the police can arrest anyone, though, Willbury says that he's a lawyer and a circuit judge, which makes them hesitate.
Then Snatcher has a convo with the Chief, complete with weird catch phrases and funny hand gestures. Marjorie hypothesizes that they're both members of guilds that are like secret organizations with agreements in place.
Whatever they do, it works, and the police end up doing everything Snatcher says. They arrest Arthur for theft, and leave him (and his wings) in Snatcher's custody.