The Doctor had ventured out himself, needing groceries to stock the TARDIS kitchen as he was now playing host to several young women. He'd found that his chocolate stores tended to disappear at a rapid pace these days. He supposed, given how much chocolate his female companions generally consumed on their own, it was no surprise that he had trouble keeping up with multiple women.
Though, really, it wasn't entirely their fault. He ate rather a lot of chocolate as well, especially with bananas.
He was taking a risk, going out in the snow. Snow had not been a herald of good things to come for him for this entire incarnation, and unnatural snow was even worse.
So, while he was a bit surprised by the woman he saw standing near the stoplight, he was not entirely surprised that something unlikely (indeed, impossible) had happened. He was rather more surprised that it was an unlikely and impossible event that didn't appear to have the potential to immediately kill him.
"Romana?" he asked, his voice squeaking at the end of her name, the way it usually did when he was caught completely off guard. He supposed, if he looked like he'd seen a ghost, it only made sense. After all, she was supposed to be dead.