"You don't need to be a mechanic. You've got a good head on your shoulders, Rose Tyler, and you know how to use it. Tell me what you see and what you don't." It's a distraction mostly, to keep the worries at bay. He holds the sonic between his teeth as he plunges both hands into the wiring. The live one electrocutes him a bit, enough to raise the hair on his arms, but it's no more than a static shock on an old rug.

The other question is a bit of a strange one and he wonders if it's weighing on her mind more than she's letting on.

"When has that ever mattered?"