OK, so this is why I didn't write a long post, because there is so much there, but:
DOCTOR: It's not just his life at stake. It's yours. You want to sacrifice yourself for this? You want me to sacrifice you?
It's allllll about the Doctor's issues. Bill (who had to be sacrificed) and Clara (who sacrificed herself), and neither of whom the Doctor could save in the end. It's about what the Doctor is willing to lose, and she can't do THIS again. *waves towards all of Twelve* I have a ton of Thirteen thoughts, because she finally snapped together, and this was a big reason why.
She is smart enough to construct the argument so they'll agree with her, but she is clinging on for dear life.
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DOCTOR: It's not just his life at stake. It's yours. You want to sacrifice yourself for this? You want me to sacrifice you?
It's allllll about the Doctor's issues. Bill (who had to be sacrificed) and Clara (who sacrificed herself), and neither of whom the Doctor could save in the end. It's about what the Doctor is willing to lose, and she can't do THIS again. *waves towards all of Twelve* I have a ton of Thirteen thoughts, because she finally snapped together, and this was a big reason why.
She is smart enough to construct the argument so they'll agree with her, but she is clinging on for dear life.