The new thing that happens in this episode that [Clara] understands or has a growing understanding episode to episode is that dark though the role of the Time Lord can be, it’s also exhilarating and exciting. She’s understanding the addiction better and better with every adventure they share. I think in [the Doctor’s] darker hours he would always comfort himself with the idea, the old idea, that he makes people better. In this episode, he’s forced to conclude that maybe he’s making Clara worse. She’s picking up from him things of which are necessary but of which he is not proud.
—  Steven Moffat on Clara Oswald and 12 in Flatline (x)
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