It's just a little bit of the picture, the Doctor trying to sort it out. He's seen what humans can do to other humans in the heat of the moment. Terrible things. Beautiful things. Sometimes both at once, where it tends to get cagey, and from the way Eva talks about it that curt tone of hers, he thinks it's a far cry from beautiful. It's also already done. It's not as simple as popping back in time and giving a few gentle, thoughtful nudges, after all.

"I thought I heard something about cultists," the Doctor says, his tone deceptively neutral. "So you and another human and things got messy, in a manner of speaking."

He says "messy" almost like it's a delicate word, his head tilted slightly to the side as he searches Eva's face past the bars.