"Doctor!" Clara screamed. No matter how hard she tried to hold on, to fight against it, something was sucking her away from her best friend and into nothingness.

"Clara!"

The Doctor reached for her, from the threshold of his time machine, and managed to grab her by the hands.

He drew her back inside and, once the doors were safely closed behind them, he pulled her into a tight embrace.

"Oh my Clara," he breathed into her hair. "I thought I was going to lose you."

"Don't worry, Doctor," she smiled against his chest. "That won't happen any time soon."