Her eyebrow arches at his use of 'bargained.' Very careful not to move lest he take it as a personal attack -- this close, Jack is likely to be a bit jumpy -- she searches his eyes for some hint of what he must really be saying.

"You seem to know them both better than I," she replies, matching her volume to his. "Do you honestly think either can conceive of his defeat, whether we fight or not?"

She's counting on their pride.