Pearson disguises himself as Signet in the prop wagon, successfully baiting Queen Imogen out of the castle before the party.
The changeling joins Samantha, Clay-ton, Very Sullen, and all inspected props inside the final caravan cart. To most observers he appears to be Signet in a robe.
High-elf guards hesitate but do not attack the apparent enemy, supporting Signet's theory that Imogen reserved the right to confront her personally. Additional guards in black jackets enter the cart to inspect the decoy.
The deception works beyond expectation: Queen Imogen herself materializes in Carl's wagon and challenges him for trying to smuggle someone who resembles her half-sister into the castle.
A changeling concealed beneath the exact robed form of half-naiad Signet.
Pearson's decoy draws the country boss away from her protected castle and reveals her hidden identity.