Rose got the scanner and placed it where the Doctor needed to check for what poison it was. Once it showed, Caitlyn and Jack showed up. "Good, I need one of you to put in this poison and the other to go and get the cure if the TARDIS has it. Please get going!" Rose pleads, making Caitlyn quickly go to the medicine corner. 
"You type it in Jack and I'll see if we have it." Caitlyn said quickly going, flying up the stairs and to the medicine cabinets. She wouldn't worry what the hallucination said right now, what was important, was getting the Doctor healed.