"Why, yes, I am rather. I've worked on hundreds of computers but to actually be inside one! It gives one an entirely different perspective!"

Which to the Doctor was new, amazing and wonderful but... not so, he suspected, for his new acquaintance.

"Don't worry, it won't be hard. Have you ever crossed a log over a stream? This will be just like that."

Only they were crossing a burning river of superheated coolant that would boil them alive if they fell in. Simple!