Time

"You have to untangle yourself from this," said a voice Chang Chang did not, at first, recognize.

She looked up, and for some reason was unsurprised to find Tau standing in the shadows of the tower. "I didn't think you could weave yourself into memories," Chang Chang said.

"Only yours, it would seem," Tau replied. "But I would rather not be here. This is a foul place, and you're needed elsewhere."

"I don't know how to leave," she said. "What if the plague won't let me?"

Tau made a motion with his gnarled hand, and his staff appeared in the clawed grip, as if it had always been there, invisible.