It's all AU.

William had found the library. In fact, he'd found several libraries, but this was his favourite - looking as if it had come straight from his era, with lots of dark wood shelves filled with ancient-looking volumes, and little corners with comfortable chairs and reading lights and tables to put piles of books on.

He was currently chuckling at a book that claimed to be an authority on vampires.

"Can you believe this?" he asked out loud, when he heard someone nearby. "As if any vampires actually sleep in a coffin!" He cocked his head. "Well, except Dracula, but he only does it for theatrics."

He'd given up looking for a version of Theta, heading back towards his TARDIS instead. He stopped abruptly, frowning, when he saw a sword leaning against a building. Covered in blood.

Crouching down, he studied it for a long moment without reaching out to touch it, looking up when he heard footsteps. "Hello, there. Do you know how fascinating it is to actually find a weapon in this place?"

He'd just found Xin Rong dead on the floor of their home, completely drained, and Drusilla standing over her, laughing maniacally and very obviously waiting for his reaction.

He'd grabbed his sword and cut off her head without a second thought. Then he staggered outside, heart breaking and stomach churning - only to find that the street outside didn't look like turn of the century China any more. Somehow he seemed to have been transported to somewhere that looked like an extremely futuristic city.

William stared about him, panting and wild-eyed, bloody sword raised defensively. "Wha - what?"