With only a giant open-fronted, metal, robotic creature barring the Doctor and Donna from the exit, there, at this point, was only one means of escape.
Running head-on in its direction.
"Doctor, please tell me you've got some sorta plan developing in that big ol' Time Lord brain of yours!" Donna did not seem to enjoy being clunked towards by this creature. That was all right. The creature didn't like her much, either.
"Well, yes," he said in a 'sort of' sort of tone.
"Well, really, I figure Dr. Downsty's creation won't take it too well if we throw a spanner in the works."
"Meaning?" Donna was growing more and more impatient the closer the thing got to them; honestly, now was not the time for idioms. It was the time for getting the bleeding hell out of here. The Doctor gave her a mildly bemused look, glancing for a moment at the advancing robotic creature with its exposed, clanking gears.
"Meaning... we throw a spanner in the works." He held up a spanner that he'd no doubt procured from the infinite depths of his pocket, waved it a little. Donna nearly laughed.
"Well, let's stop talking and do it!"
"Right, then! C'mere, robot!"
((ooc: Oh my god I'm so impossibly bored. Ignore my lameness.))