This is a question pertaining to the Polymorph and the Transition Zone.
If I were to purchase a character die and have sidekick in the field zone. I then use polymorph which text reads swap a character with a non-NPC character from that players used pile. Spin the character to level 1. This does not trigger "when fielded" effects. Would the sidekick then go out of play due to it previously being in the field or would it take the position of the character in the used pile? Due to the ruling on the used pile/transition zone one would believe that since the die was in the field it would first have to go out of play before it could go to the used pile. However, the word swap would imply that the dice do nothing more than change positions. Further clarification would be greatly appreciated. Does the originally fielded character go out of play or into the used pile?