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If we approached Impa by saying 'this is a thing we're doing,' she'd dismember all of us. It helps being thorough so she understands that we know what it all means and what the consequences might entail. Regardless, I can't foresee her taking it lightly even if we lay all the facts on the table.
She might have a document or two to help, I'm not sure. There's some things she keeps from me on purpose and doesn't think I'm keen enough to realize it, but I'm sure when the time comes, I can pressure it out of her.