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If i exchange a hero with my opponent and place it in Goshen, does it return to my opponent after the two turns?

Stalks of Flax (TP)
Type: Artifact • Brigade: None • Ability: None • Class: None • Special Ability: On activation, discard this card to exchange two O.T. human Heroes in your territory with two Heroes in an opponent's territory for two turns. • Identifiers: None • Verse: Joshua 2:6 • Availability: Thesaurus ex Preteritus booster packs ()

Goshen (P)
Type: Fortress • Brigade: None • Ability: None • Class: None • Special Ability: Protect contents from all effects. If your Genesis or Exodus Hero has toughness */0 or less, you may place it here instead of discarding it. • Play As: Protect contents from harm or effect. Place or return Heroes during your Preparation Phase. If your Genesis Hero or Exodus Hero has toughness */0 or less, you may place it here instead of discarding it. Goshen may hold any number of Heroes of up to three brigades. • Identifiers: Play to territory. • Verse: Exodus 9:26 • Availability: Promotional cards (2008 Local Tournament)

I see stalks as a one time effect even though it spans across several turns. I would argue that because they aren't protected when the ability activates, they would still return to owner's territory

that just doesnt make sense that it would exchange back. it doesnt have protection when exchanged but then it gains protection from goshen. just seems odd.