Why Is Freya Attacking Kratos in God of War Ragnarök?

Freya is upset with Kratos when "God of War Ragnarök" begins for reasons that might not be clear to players who have not played the first game.

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So what am I missing?? “[Freya cannot fight, even to defend herself. No living thing may she harm by blade nor spell.]” -Mimir : r/GodofWar