Having an old friend about in times like this was exactly what the Doctor needed. Somehow, he couldn't help but think that the people behind the curtain were doing him some sort of favor. Intuitively, he supposed, he ought to be upset about the presence of Sarah - she had commitments and responsibilities and a life; but, they'd taken on worse than whomever supposed they were in charge here - and as a teammate, it was hard for the Doctor to think of anyone better.
"Mauve, universal sign of distress - didn't we ever encounter mauve?" The Doctor's brow furrowed. Perhaps they hadn't.
"Well, the modulator is mostly completed; what these people need is something completely different than something to break the wall, Sarah Jane. Some of them are actually starting to lose hope we'll get out of here at all." The Doctor took a moment to pause. "I know as well as anyone the odds as to whether or not the modulator will break the glass are 60/40 at best. So, if it fails, Sarah, I'm going to need all the help you can muster picking this lot up by their bootstraps."
Another pause and a patented Doctor grin to follow, "Well, that and calibrating the modulator."