"I know that." And he did, but it was damn difficult to look someone in the eyes when they were shorter than him and leaning forward, especially since he had meant to be inconspicuous about it. John panicking wouldn't do them any good whatsoever after all. He had been leaning the way, but then John almost fell over and the Doctor was by his side instantly, having expected something like that. He tried to keep him upright, one arm sliding around him as he coaxed him forward. They had to get to the med bay if he had any hope of treating John right. And fast.

"It's alright, John. You'll be alright." At least he sounded calm. "I'm just going to go to the med bay with you, run some test and you'll be right as rain. Can you walk?" He better, because the Doctor doubted his ability to carry him very far. "Trust me, alright? I'm the Doctor." It had to be the same virus, but it had to have mutated. He hadn't thought it could do that this fast. He had to get working on developing a cure right away.