Martha lightly touches his shoulder and he turns his head to look at her.
"Martha Jones," he says, his voice flat, as if he's reading from a telephone book. "Companion to the Doctor, and a doctor herself. You kissed him once, didn't you? So beautiful..."
He blinks rapidly then, as if regaining some sense of focus, and realizes she's in the snow, wearing only jeans and an undershirt. A small smile curls the corners of his mouth.
"You're gonna freeze your cute, little ass if we don't get you inside," he says quietly. He looks at the red-haired woman, then the Doctor, then finally, the body of Rose Tyler, still wrapped in his coat.
He swallows. I'm so sorry, Rosie, but I need that back... He leans down, kisses Rose's cheek and disentangles his great, grey coat from her body and the arms of the Doctor. He looks the Doctor in the eye, says, "Martha needs this," and places his coat across the shoulders of the young physician, keeping one arm wrapped around her protectively. The Doctor is still holding Rose.