[The Doctor doesn't move, he simply smiles as he watches the man]

Ah the priorities. Always more concerned about Barbara's well being than your own. [He shakes his head, suddenly nostalgic] Don't always see that nowadays. Of course for a while I was only traveling with one companion at a time. Easier to keep track of that way, what with them always wandering off and all that.

{Figure out who he is, yet?]