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Hmm. Does Godric even know anything about this? He wasn't on the battlefield. This is a contentious point. Isabelle and Godric knew that Nikolai was going into battle, but did they know with whom exactly? Because if they knew that the battle would be specifically against Agrail, then by admitting to Isabelle that he is Agrail, Railag would be admitting to the murder of the king.
Whatever