The Doctor was looking at them. He smiled slightly though he could sense that Jack was annoyed and upset with him and trying to hide it. He had known Jack would be, he was glad that despite that Jack was here to help. He did know that it would be hard for Jack to be hiding his feelings right now. He had a feeling Jack would have thought he hated him.
Jack finds the right vial and grinned "Think got it," he was sure that one matched the description. He walked over to his friend with it. The Doctor takes the medicine and then looked at Jack.
"I know you are trying to not yell at me because I'm sick, But you don't need to push back your feelings." The Doctor didn't want to loose Jack as a friend really.