I run to the door at full speed, rush out, and look around for the scoundrel, including by his aura. If I don't see anyone, I call the guard. If the door is suddenly locked (a master lockpicker, who sealed the door with a lockpick in a second), then if I don't see any other doors/windows, I try to break it down as best I can. If I can't, I knock on it and call someone.
The door opens. The captain of the port guard and four of his subordinates enter.

— What's going on here? We heard some noise.
), then if I don't see any other doors/windows, I try to break it down as best I can. If I can't, I knock on it and call someone.