[He searches the face to be sure...and yes. That's definitely his old friend. And that's almost a smile on the grumpy face, though it's masked by irritation at how sick Marty looks.]

Come on, man, what are you doing? Wandering around the street when you're out of it like this, people'll hurt you. So you're going home to kick your feet up and play some games. Which way're we going?