Use this extreme situation to dig into their relationship. How do they feel about each other? Is their primary emotion jealousy or devotion.
What dramatic event has led to their predicament? How will they each help the other to escape?
Add in an unconventional characteristic the pair have in common, and explore how they might use it to improve their situation.
To skew the balance of power, provide just one with a tool that could help with their situation. Do they choose to share their advantage or keep it to themselves?
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