Wallie reaches, straining to grasp the Doctor's hand, but he can't reach, and it's becoming strangely difficult to move much in any direction. A numbness, a stiffness, a tension in his muscles that goes far beyond adrenaline. Some sort of poison, he realises, but it's far too late to do anything.

Around him, the tentacle gives him a vicious squeeze, then flings him to one side; Wallie hits the water with a splash. Were things different he could swim to safety, but now, he simply can't. He sinks, unable to swim to the surface, and he doesn't even have the muscle control to hold his breath.

He thinks of Jja as water enters his lungs, cold and dense, and blacks out shortly after.