Martha diverted her attention from the piece of paper Jack had showed her to the more than familiar sound of the TARDIS. She smiled broadly when it finally appeared out of thin air and the Doctor stepped out of it, looking around. It ocurred to her then, that the Doctor had never been in the Hub before, hence his expression.
"Doctor!" she exclaimed while she hurried to hug him. She may have seen him just four days ago, but still shee felt the need to reassure he was fine.