Even though the mask doesn't allow her the full effect of the Doctor's reaction, River chuckles and strokes her thumb over her wife's wrist. Her wife. She hadn't been expecting another of those. And now she's particularly cursing the masks. If she could have kissed her in that moment, she would have.

At least some things never change, no matter how many faces the Doctor wears. And true to form, she's already moved on to the problem at hand.

"I've started to get a suspicion," she admits. "You aren't going to like it much more than I do."