(Before the cubes appeared...)
Jack was on high alert, moving through the halls, checking to see if anyone needed help and trying to figure out exactly what was going on. He didn't expect someone to fling themselves through the Lobby doors and drop to their knees - let alone the intrepid Martha Jones.
"Martha?" He crossed to her quickly and crouched down, his eyes sweeping over her, assessing her condition. "Are you okay? Did you just run the marathon or something?" And then, "Have you seen the Doctor?"