The Doctor opened his mouth to ask just how the Master was able to find the parts repair his screwdriver. He snapped it shut when he realized that was exactly what he wanted him to do.

"Right," the Doctor fumbled. He tried to recover. "Well, off with you then!"

With River on one side and the Master on the other, the Doctor felt terribly off balance, the exact same sort of feeling you had when you tried to jump with your shoes nailed to the floor. (Trust him, he knew what it was like - personal experience, long story, no time to go into it). He made a shooing motion at the Master as if of course he expected him to repair the...unrepairable laser screwdriver. He thought he'd made it unrepairable. Odd! The Doctor remained where he was still propped up against the base of the console as he tracked the Master's progress, sniffling quietly to himself and feeling his nose running. Things seemed to be going nicely up until the moment sparks erupted practically in front of the Master and that...

That smell! The Doctor to cover his nose, decided on second thought he was happy to take his slime tunnel over getting that smell right in the face, and he almost felt sorry for the Master.

Almost.