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In spite of everything, Jim isn't certain he's going to do it. Not until Bill starts talking.
The first three words can be overlooked. Bill may not mean them, but he says them to be kind. They give Jim the chance say them back.
It's the next three words ("Come with me") that make Jim decide. They, too, may represent a lie, or they may be a sincere expression of Bill's desires. Either way, they're a monstrous betrayal.
The treason, the torture might be forgiven, but not making Jim turn traitor to his own heart. For that, Bill must pay.