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They would become two sides of the same spinning coin. For neither one could exist without the other, but neither would they stand side by side. Touched but never touched, they would fight in desperation. Together but apart, they would long with love. Brothers, standing back to back, Thor pointed towards the light and Loki spun around to live on the dark side. It would have to be enough.
The Chitauri and Thanos capture Thor to cause Loki the most unimaginable pain. Loki joins with the Avengers to get him back.