I adore Katarina (aka Jones) in this episode. We only get a few minutes of her in the other reality, deprived of the machine and her obsession with changing the past, but it shows so much… I bet that once she couldn’t put all her energy and hope in the machine anymore, didn’t have anything to focus on, the weight of all the people she killed striving after futility finally hit her. And that’s what caused the suicide attempt.
Which is part of her wanting Cole to know, in particular for her alternate self to tell him, that he is a sacrifice. She has enough distance to know that what the other Katarina is doing isn't right. She had to live with herself after all the distractions and justifications were stripped away. And by giving Cole the key to get the truth out of the other Katarina, she's reaching out to herself as well as him. Each time original!Katarina hits the button to splinter him she's killing him piece by piece. And he should know. I've been thinking a lot about how there's a sort of Abraham + Isaac thing about them -- Katarina leading people to her scientific alter and sacrificing them for her big ideas. But here things shift in a major way as Cole accepts that he won't just die if they succeed. If he fails he will have nothing, no life. He's choosing to give up his life.
Related to that, I loved how Ramse and Katarina’s ethical discussion carried out in an AU where we get to *see* what following Ramse’s logic and trying to care for the people of the present rather than sacrifice everything to change the past looks like. And that happens even as Cole pushes him to restart the machine, end everything he's built. Which, honestly, I think Ramse did more for love of his lost friend than anything. I don’t think he’s entirely persuaded by Team End Everything. I hope not. It makes for a great ethical conflict.