It had been a small blessing that whatever oddness had been thrust upon them put Nebula in the familiar territory of the TARDIS. Even if this ship wasn't that of the Doctor she knew best, it was similar enough that appearing inside it hadn't frightened her into violent action. She'd been startled, certainly, but once she'd realized she'd been transported into a room with a sleeping human and had a few moments to catch her breath, she'd uncocked her weapon and only held it tightly in her hand, looking around rather confused.
While Rose had still been asleep, Nebula had tried to leave multiple times. She's counted the exact number of steps it'd taken to be transported back to the human's side. This was frustrating but not frightening. And when Rose blinked over at her, Nebula glared down. "I believe something strange is happening again," she said in her monotone voice. Her weapon was still drawn, but she wasn't aiming it directly at Rose. It was out to give her a sense of comfort and safety.