It stopped. It just stopped. The TARDIS stopped. The Doctor made his way over to where he last saw Donna before the lights went out.
"DOCTOR!"
"Donna where are you?"
"If I knew don't you think I would be trying to get back to the console?"
"Well feel around you and try to establish where you are and I will come for you."
"I feel, I feel, a fountain. Yes definitely a fountain. Warm water and, yuck Salt! Since when did you have a salt water fountain" Donna called back to the Doctor. I don't thought the Doctor.
The lights came back on and the Doctor glanced towards Donnas' voice.
There she is by the door. What the hell the Doctor thought. There was Donna alright, but she was beside a sandstone fountain.