The Doctor gave Nora a sad smile then nodded. "I'll find a way." She told her. Steel in her voice. "For now, take care of your sister." She turned back to the TARDIS consul, flicking levers and staring at one or another of three screens. After what felt like hours to Nora, but couldn't have been much more than ten or fifteen minutes the Doctor yelled "Got it! It's the Hyiasam! The Torx release Hyiasam as a byproduct of their connection." The Doctor stumbled over the last word, as if that wasn't the word she wanted to use.

"Hyiasam is extremely reactive, hence why eventually humans will harvest it from some planets that produce it naturally to make a super-efficient fuel. What I can do, I think I can do, is since the human body doesn't react with Hyiasam as all is stop the Torx system from releasing the Hyiasam. It'll poison the Torx, but the human should be spared. As long as they haven't been hooked up to the Torx for too long. I am sorry, but if the Torx has been feeding off of the human for too long the human is already dead, just a shell and the Torx would have been moving on soon anyway." The Doctor frowned at the prospect, but there wasn't anything she could do. Not everyone would live today, but maybe mostly everyone could.

"Biggest problem I can see...is I'll have to be really close to someone infected by a Torx to reverse the process. I might be able to get a burst, that hits most of London, but if they have spread out of London, then I won't get them all."