Rule 411.4
If an ability triggers when “you” do something, it triggers when a Game Action that you are responsible for occurs. Example: A gear reads “When you move an enemy unit, you may exhaust this to [Stun] it.” It will trigger whenever a move game action that you are responsible for causes an enemy unit to move. If an opponent plays a spell that reads “choose a Battlefield. Each player may move a unit they don’t control to that battlefield,” and a player that controls the gear chooses to move an enemy unit, their gear will trigger.