He had noticed that the lad had stepped back. It's a reaction he's used to now. which is why he doesn't seem to care. He adjusts all his belongings that he's carrying so he can offer his hand.

"I'm the Doctor."

He takes a look around.

"Any proper idea where we are?"

Look at him, probably not, but you never know where good information will come from, so repeating questions with different people never hurts.