The Doctor ceased his kicking, which he thought he was doing quite well despite the thickness of the quicksand. He'd been caught by terrifying tentacle monsters before, this should not have been such a bad situation. He'd been through far worse! He relaxed and the monster's grip loosened, though it started to pull back, and pull the Doctor with it.

He caught movement just above Jack's head. Another centipede, this one with huge, black teeth, was crawling down a tree and towards them. Oh, that was all they needed. He then snapped his gaze back to Jack.

"Jack. When I say 'now', I need you to let go of me and roll over, all right? Do not look behind yourself. Okay, do not."