“What?” The startled exclamation is all the Doctor can manage. One second he’d been alone in the TARDIS and the next instant there’s a flash of light and some redheaded woman in a wedding dress is standing right there!
How she got aboard the Doctor doesn’t know. It shouldn’t be possible; the TARDIS is in flight! But there she is, large as life, looking even less pleased with the situation that he feels. He’s got a horrible feeling she’s going to blame this on him, even though he’s done nothing. He’s sure of it.
“What?” is the only logical response.