Jack picked up his phone to call in to arrange things for when they arrived at the hospital. He wanted to keep this quiet until he could get a better handle on what had happened to Fred. He didn't want to give whomever had tried to kill her a second chance.
He didn't dial just yet and instead glanced over at Fred.
"Don't go to sleep just yet, please. Just stay with me."
He finished dialing and gave enough information to set things up. He rushed because it was important to keep Fred conscious, just in case. Once he hung up, he slid his eyes to check to see if she was awake again before returning them to the road and answering her.