Theodore started very slightly when they appeared, his wand in his hand, though he did not expect to need to defend himself. His patient would presumably consider themselves to be in far more danger than he, after all, since he would be using his wand on them. He saw only two people, which was unsurprising, he had not expected an injured to come alone. He had not entirely expected his patient to be able to move on his own.
"Hello," he said, with a polite smile. "Normally I'd start by telling you that my name is Theodore Nott, and I'll be your Healer. This isn't my usual clinic, but I've done what I can to make it as close as possible." He could tell by looking at them which was the worst hurt, though it was possible the girl was also injured or sick, just less visibly. "Please, have a seat."