She hears him before she sees him, which is admittedly surprising because of-- well, everything about him. He tends to stand out. In her defense, she was far more focused on the path in front of her, and that coat of his managed to blend in with the trees well enough.

Romana stops short in her walking, throwing her arms up just a bit in exasperation as he approaches.

"Doctor! There you are. I was beginning to think you'd just wandered off for good." She wants to be annoyed, and on some level she is, but she's smiling anyways. It's always relieving to have things be going right (for a change), even if she's not sure how they both managed to get away from the Tardis and from each other in what seemed like such a short timespan. Seemed is always the operative word, though, isn't it?

"What's going on? Do you know what's happened to the Tardis?"