"Oh, I had lessons from the very best. […] It's a shame you were busy that day."
"No, no, no, the zig zag plotter, not the atom accelerator!" Koschei shouted, quickly righting the mistake his pupil had just made.
"Well excuse me!" River scoffed. "Not as if you told me that before I'd already fumbled with the atom accelerator!"
Koschei groaned as he checked the scanner. "Great, now we're on Barcelona of all places." He held up a hand as River opened her mouth. "The planet, not the place on Earth."
River sighed heavily, crossing her arms as she leaned against the rails. "Why can't the Doctor teach me?" She wondered aloud. Koschei glared.
"He can't teach you because he's rearranging the wardrobe... or something. I'm not sure. Now let's try again."