Oh dear, it's great! The characterisation is sizzling and Clara picks up so many little things in him. It's fascinating, a puzzle. So nice to have the companion's point of view on the Doctor, but benefiting from that sharpness and speed so Oswin indeed. I really love it when companions or new character doubt the Doctor, at the beginning or in the middle, even a little bit. All his slips are like tiny punctures and she catches them. But doesn't budge. As before the "Do not open door" in the TARDIS, she knows it might be dangerous and he should not entirely be trusted, but jump in anyway.

"You really picked up that Oswin thing, didn't you?"
Great line by the way! Sharp and teensy bit cat and mouse.

It's quite a perfect little piece, very dancing and twirling!

"Yes, possibly, probably, indeed. And who was that?" Stupid favourite line. The rhythm is perfect, the tone delicious, the characterisation spot-on. The Doctor should have the first sentence tattooed on his forehead.